Streamlit app showing selection boxes with cascading (dependent) options

st_cascade_selection.py

import json
import streamlit as st
import pandas as pd

st.set_page_config(
    page_title='Cascade Selection',
    layout='centered',
    page_icon='🌴'
)

BASE_PATH = "."

@st.cache(persist=True, allow_output_mutation=True)
def load_locations():
    with open(f'{BASE_PATH}/z-global-locations.json', 'rt', encoding='utf8') as f:
        locations_str = f.read()
    locations_json = json.loads(locations_str)
    return (locations_json)

locations = load_locations()

c1, _, c3 = st.columns([3,1,4])
with c1:
    st.subheader('Locations data')
    st.json(locations, expanded=False)
with c3:
    st.subheader('Cascade selections')
    region = st.selectbox('Select region', options=locations.keys())
    country = st.selectbox('Select country', options=locations[region].keys())
    cities = st.selectbox('Select city', options=locations[region][country])
    

z-global-locations.json

{
    "Africa": {
        "Algeria": [
            "Algiers",
            "Constantine",
            "Oran"
        ],
        "Angola": [
            "Huambo",
            "Luanda"
        ],
        "Benin": [
            "Cotonou"
        ],
        "Botswana": [
            "Gaborone"
        ],
        "Burkina Faso": [
            "Ouagadougou"
        ],
        "Burundi": [
            "Bujumbura"
        ],
        "Cameroon": [
            "Douala",
            "Yaound\u00e9"
        ],
        "Cape Verde": [
            "Praia"
        ],
        "Central African Republic": [
            "Bangui"
        ],
        "Chad": [
            "N'Djamena"
        ],
        "Congo": [
            "Brazzaville",
            "Pointe-Noire"
        ],
        "C\u00f4te d'Ivoire": [
            "Abidjan",
            "Yamoussoukro"
        ],
        "Democratic Republic of Congo": [
            "Kinshasa"
        ],
        "Djibouti": [
            "Djibouti City"
        ],
        "Egypt": [
            "Alexandria",
            "Cairo",
            "El-Mansoura",
            "Luxor",
            "Mahalla el-Kubra",
            "Port Said",
            "Suez"
        ],
        "Equatorial Guinea": [
            "Malabo"
        ],
        "Eritrea": [
            "Asmara"
        ],
        "Eswatini": [
            "Mbabane"
        ],
        "Ethiopia": [
            "Addis Ababa"
        ],
        "Gabon": [
            "Libreville"
        ],
        "Gambia": [
            "Banjul"
        ],
        "Ghana": [
            "Accra",
            "Kumasi"
        ],
        "Guinea": [
            "Conakry"
        ],
        "Guinea-Bissau": [
            "Bissau"
        ],
        "Kenya": [
            "Mombasa",
            "Nairobi"
        ],
        "Lesotho": [
            "Maseru"
        ],
        "Liberia": [
            "Monrovia"
        ],
        "Libya": [
            "Tripoli"
        ],
        "Madagascar": [
            "Antananarivo"
        ],
        "Malawi": [
            "Blantyre City",
            "Lilongwe"
        ],
        "Mali": [
            "Bamako"
        ],
        "Mauritania": [
            "Nouakchott"
        ],
        "Mauritius": [
            "Port Louis"
        ],
        "Morocco": [
            "Agadir",
            "Casablanca",
            "Fes",
            "Marrakech",
            "Meknes",
            "Rabat",
            "Tangier"
        ],
        "Mozambique": [
            "Beira",
            "Maputo"
        ],
        "Namibia": [
            "Windhoek"
        ],
        "Niger": [
            "Niamey"
        ],
        "Nigeria": [
            "Aba",
            "Abeokuta",
            "Abuja",
            "Benin City",
            "Enugu",
            "Ibadan",
            "Ilorin",
            "Jos",
            "Kaduna",
            "Kano",
            "Lagos",
            "Maiduguri",
            "Ogbomosho",
            "Onitsha",
            "Port Harcourt",
            "Zaria"
        ],
        "Rwanda": [
            "Kigali"
        ],
        "Senegal": [
            "Dakar"
        ],
        "Sierra Leone": [
            "Freetown"
        ],
        "South Africa": [
            "Bloemfontein",
            "Buffalo City",
            "Cape Town",
            "Durban",
            "Johannesburg",
            "Kimberley",
            "Polokwane",
            "Port Elizabeth",
            "Pretoria"
        ],
        "Sudan": [
            "Khartoum"
        ],
        "Tanzania": [
            "Arusha",
            "Dar Es Salaam",
            "Dodoma",
            "Mwanza"
        ],
        "Togo": [
            "Lom\u00e9"
        ],
        "Tunisia": [
            "Sfax",
            "Sousse",
            "Tunis"
        ],
        "Uganda": [
            "Kampala"
        ],
        "Zambia": [
            "Kitwe",
            "Lusaka",
            "Ndola"
        ],
        "Zimbabwe": [
            "Bulawayo",
            "Harare"
        ]
    },
    "Americas": {
        "Argentina": [
            "Buenos Aires",
            "C\u00f3rdoba",
            "La Plata",
            "Mendoza",
            "Rosario",
            "Salta",
            "San Miguel De Tucum\u00e1n"
        ],
        "Bahamas": [
            "Nassau"
        ],
        "Barbados": [
            "Bridgetown"
        ],
        "Bolivia": [
            "Cochabamba",
            "La Paz",
            "Santa Cruz"
        ],
        "Brazil": [
            "Aracaju",
            "Baixada Santista",
            "Belo Horizonte",
            "Bel\u00e9m",
            "Bras\u00edlia",
            "Campo Grande",
            "Cuiab\u00e1",
            "Curitiba",
            "Florian\u00f3polis",
            "Fortaleza",
            "Goi\u00e2nia",
            "Grande S\u00e3o Lu\u00eds",
            "Joinville",
            "Jo\u00e3o Pessoa",
            "Macei\u00f3",
            "Manaus",
            "Natal",
            "Porto Alegre",
            "Recife",
            "Ribeirao Pr\u00eato",
            "Rio de Janeiro",
            "Salvador",
            "Sao Jos\u00e9 dos Campos",
            "Sorocaba",
            "S\u00e3o Paulo",
            "Teresina"
        ],
        "Canada": [
            "Calgary",
            "Edmonton",
            "Halifax",
            "Hamilton",
            "Montr\u00e9al",
            "Ottawa-Gatineau",
            "Quebec City",
            "Toronto",
            "Vancouver",
            "Winnipeg"
        ],
        "Chile": [
            "Concepci\u00f3n",
            "Santiago",
            "Valpara\u00edso"
        ],
        "Colombia": [
            "Barranquilla",
            "Bogot\u00e1",
            "Bucaramanga",
            "Cali",
            "Cartagena",
            "C\u00facuta",
            "Ibagu\u00e9",
            "Medell\u00edn"
        ],
        "Costa Rica": [
            "San Jos\u00e9 (Costa Rica)"
        ],
        "Cuba": [
            "Havana"
        ],
        "Dominican Republic": [
            "Santo Domingo"
        ],
        "Ecuador": [
            "Guayaquil",
            "Quito"
        ],
        "El Salvador": [
            "San Salvador"
        ],
        "Guatemala": [
            "Guatemala City"
        ],
        "Guyana": [
            "Georgetown (Guyana)"
        ],
        "Haiti": [
            "Port-Au-Prince"
        ],
        "Honduras": [
            "Tegucigalpa"
        ],
        "Jamaica": [
            "Kingston"
        ],
        "Mexico": [
            "Acapulco",
            "Aguascalientes",
            "Canc\u00fan",
            "Chihuahua",
            "Cuernavaca",
            "Culiac\u00e1n",
            "Guadalajara",
            "Hermosillo",
            "Ju\u00e1rez",
            "Le\u00f3n",
            "Matamoros",
            "Mexicali",
            "Mexico City",
            "Monterrey",
            "Morelia",
            "M\u00e9rida",
            "Oaxaca",
            "Puebla",
            "Quer\u00e9taro",
            "Reynosa",
            "Saltillo",
            "San Luis Potos\u00ed",
            "Tampico",
            "Tijuana",
            "Toluca",
            "Tuxtla Guti\u00e9rrez",
            "Veracruz",
            "Xalapa"
        ],
        "Nicaragua": [
            "Managua"
        ],
        "Panama": [
            "Panama City"
        ],
        "Paraguay": [
            "Asunci\u00f3n"
        ],
        "Peru": [
            "Arequipa",
            "Chiclayo",
            "Lima",
            "Trujillo"
        ],
        "Puerto Rico": [
            "San Juan"
        ],
        "Suriname": [
            "Paramaribo"
        ],
        "United States": [
            "Akron",
            "Albany",
            "Albuquerque",
            "Allentown",
            "Atlanta",
            "Austin",
            "Bakersfield",
            "Baltimore",
            "Baton Rouge",
            "Birmingham (US)",
            "Boise City",
            "Boston",
            "Bridgeport",
            "Buffalo",
            "Charleston",
            "Charlotte",
            "Chicago",
            "Cincinnati",
            "Cleveland",
            "Colorado Springs",
            "Columbia",
            "Columbus",
            "Dallas",
            "Dayton",
            "Denver",
            "Des Moines",
            "Detroit",
            "Durham",
            "El Paso",
            "Fort Myers",
            "Fresno",
            "Grand Rapids",
            "Greensboro",
            "Greenville",
            "Harrisburg",
            "Hartford",
            "Honolulu",
            "Houston",
            "Indianapolis",
            "Jacksonville",
            "Kansas City",
            "Knoxville",
            "Las Vegas",
            "Little Rock",
            "Los Angeles",
            "Louisville",
            "Madison",
            "Memphis",
            "Miami",
            "Milwaukee",
            "Minneapolis",
            "Nashville",
            "New Haven",
            "New Orleans",
            "New York",
            "North Port",
            "Oklahoma City",
            "Omaha",
            "Orlando",
            "Oxnard",
            "Philadelphia",
            "Phoenix",
            "Pittsburgh",
            "Portland",
            "Providence",
            "Raleigh",
            "Richmond",
            "Riverside",
            "Rochester",
            "Sacramento",
            "Salt Lake City",
            "San Antonio",
            "San Diego",
            "San Francisco",
            "San Jose (US)",
            "Seattle",
            "St. Louis",
            "Stockton",
            "Syracuse",
            "Tampa",
            "Toledo",
            "Tucson",
            "Tulsa",
            "Virginia Beach",
            "Washington, DC",
            "Wichita",
            "Winston-Salem",
            "Worcester"
        ],
        "Uruguay": [
            "Montevideo"
        ],
        "Venezuela": [
            "Barquisimeto",
            "Caracas",
            "Guayana City",
            "Maracaibo",
            "Maracay",
            "Valencia (Venezuela)"
        ]
    },
    "Asia": {
        "Afghanistan": [
            "Kabul"
        ],
        "Azerbaijan": [
            "Baku"
        ],
        "Bangladesh": [
            "Chittagong",
            "Dhaka",
            "Khulna",
            "Rajshahi"
        ],
        "Cambodia": [
            "Phnom Penh"
        ],
        "China": [
            "Anqing",
            "Anshan",
            "Anyang",
            "Baoding",
            "Baoji",
            "Baotou",
            "Beijing",
            "Binzhou",
            "Bozhou",
            "Cangzhou",
            "Changchun",
            "Changde",
            "Changsha",
            "Changzhou",
            "Chengdu",
            "Chenzhou",
            "Chifeng",
            "Chongqing",
            "Dalian",
            "Daqing",
            "Datong",
            "Dazhou",
            "Deyang",
            "Dezhou",
            "Dongguan",
            "Dongying",
            "Foshan",
            "Fushun",
            "Fuyang",
            "Fuzhou",
            "Ganzhou",
            "Guangzhou",
            "Guigang",
            "Guilin",
            "Guiyang",
            "Haikou",
            "Handan",
            "Hangzhou",
            "Harbin",
            "Hefei",
            "Hengshui",
            "Hengyang",
            "Heze",
            "Hohhot",
            "Huaian",
            "Huaihua",
            "Huainan",
            "Huanggang",
            "Huangshi",
            "Huizhou",
            "Huzhou",
            "Jiangmen",
            "Jiaozuo",
            "Jiaxing",
            "Jilin",
            "Jinan",
            "Jingzhou",
            "Jinhua",
            "Jining",
            "Jiujiang",
            "Kaifeng",
            "Kunming",
            "Langfang",
            "Lanzhou",
            "Lianyungang",
            "Liaocheng",
            "Linfen",
            "Linyi",
            "Liuan",
            "Liuzhou",
            "Luoyang",
            "Maanshan",
            "Maoming",
            "Mianyang",
            "Nanchang",
            "Nanchong",
            "Nanjing",
            "Nanning",
            "Nantong",
            "Nanyang",
            "Ningbo",
            "Pingdingshan",
            "Putian",
            "Puyang",
            "Qingdao",
            "Qingyuan",
            "Qinhuangdao",
            "Qiqihar",
            "Quanzhou",
            "Qujing",
            "Rizhao",
            "Shanghai",
            "Shangqiu",
            "Shangrao",
            "Shantou",
            "Shaoyang",
            "Shenyang",
            "Shenzhen",
            "Shijiazhuang",
            "Suqian",
            "Suzhou (Anhui)",
            "Suzhou (Jiangsu)",
            "Taian",
            "Taiyuan",
            "Taizhou (Jiangsu)",
            "Taizhou (Zhejiang)",
            "Tangshan",
            "Tianjin",
            "Urumqi",
            "Weifang",
            "Weihai",
            "Weinan",
            "Wenzhou",
            "Wuhan",
            "Wuhu",
            "Xiamen",
            "Xian",
            "Xiangfan",
            "Xianyang",
            "Xiaogan",
            "Xingtai",
            "Xinxiang",
            "Xinyang",
            "Xuchang",
            "Xuzhou",
            "Yancheng",
            "Yangzhou",
            "Yantai",
            "Yibin",
            "Yichang",
            "Yichun",
            "Yinchuan",
            "Yueyang",
            "Yulin",
            "Yuncheng",
            "Zaozhuang",
            "Zhangjiakou",
            "Zhangzhou",
            "Zhanjiang",
            "Zhaoqing",
            "Zhaotong",
            "Zhengzhou",
            "Zhenjiang",
            "Zhongshan",
            "Zhoukou",
            "Zhuhai",
            "Zhumadian",
            "Zhuzhou",
            "Zibo",
            "Zunyi"
        ],
        "Hong Kong, China": [
            "Hong Kong (City)"
        ],
        "India": [
            "Agra",
            "Ahmedabad",
            "Aligarh",
            "Amravati",
            "Amritsar",
            "Asansol",
            "Aurangabad",
            "Bareilly",
            "Belgaum",
            "Bengaluru",
            "Bhavnagar",
            "Bhilai Nagar",
            "Bhopal",
            "Bhubaneswar",
            "Bikaner",
            "Bokaro",
            "Chandigarh",
            "Chennai",
            "Coimbatore",
            "Cuttack",
            "Delhi",
            "Dhanbad",
            "Faizabad",
            "Gorakhpur",
            "Guntur",
            "Guwahati",
            "Gwalior",
            "Hubli-Dharwad",
            "Hyderabad (India)",
            "Indore",
            "Jabalpur",
            "Jaipur",
            "Jalandhar",
            "Jammu",
            "Jamshedpur",
            "Jodhpur",
            "Kannur",
            "Kanpur",
            "Kochi",
            "Kolkata",
            "Kota",
            "Kozhikode",
            "Lucknow",
            "Ludhiana",
            "Madurai",
            "Mangalore",
            "Meerut",
            "Moradabad",
            "Mumbai",
            "Muzaffarpur",
            "Mysore",
            "Nagpur",
            "Nashik",
            "Patna",
            "Pondicherry",
            "Prayagraj",
            "Pune",
            "Raipur",
            "Rajkot",
            "Ranchi",
            "Salem",
            "Solapur",
            "Srinagar",
            "Surat",
            "Thiruvananthapuram",
            "Tiruchirappalli",
            "Tiruppur",
            "Vadodara",
            "Varanasi",
            "Vijayawada",
            "Visakhapatnam",
            "Warangal"
        ],
        "Indonesia": [
            "Bandar Lampung",
            "Bandjarmasin",
            "Bandung",
            "Denpasar",
            "Jakarta",
            "Jambi",
            "Makassar",
            "Medan",
            "Padang",
            "Palembang",
            "Pekanbaru",
            "Pontianak",
            "Samarinda",
            "Semarang",
            "Surabaya",
            "Yogyakarta"
        ],
        "Japan": [
            "Fukuoka",
            "Hamamatsu",
            "Hiroshima",
            "Kagoshima",
            "Kitakyushu",
            "Kumamoto",
            "Matsuyama",
            "Nagoya",
            "Niigata",
            "Okayama",
            "Osaka-Kyoto",
            "Sapporo",
            "Sendai",
            "Tokyo",
            "Utsunomiya"
        ],
        "Kazakhstan": [
            "Almaty",
            "Nur-Sultan"
        ],
        "Kyrgyzstan": [
            "Bishkek"
        ],
        "Lao PDR": [
            "Vientiane"
        ],
        "Macao, China": [
            "Macao"
        ],
        "Malaysia": [
            "Georgetown (Malaysia)",
            "Ipoh",
            "Johor Bahru",
            "Kota Bharu",
            "Kota Kinabalu",
            "Kuala Lumpur",
            "Kuala Muda",
            "Kuantan",
            "Kuching",
            "Malacca",
            "Seremban"
        ],
        "Maldives": [
            "Male"
        ],
        "Mongolia": [
            "Ulaanbaatar"
        ],
        "Myanmar": [
            "Mandalay",
            "Nay Pyi Taw",
            "Yangon"
        ],
        "Nepal": [
            "Kathmandu"
        ],
        "Pakistan": [
            "Faisalabad",
            "Gujranwala",
            "Hyderabad (Pakistan)",
            "Islamabad-Rawalpindi",
            "Karachi",
            "Lahore",
            "Multan",
            "Peshawar",
            "Quetta"
        ],
        "Philippines": [
            "Angeles City",
            "Bacolod",
            "Cagayan de Oro",
            "Cebu City",
            "Dagupan",
            "Davao City",
            "General Santos",
            "Manila",
            "Zamboanga City"
        ],
        "Singapore": [
            "Singapore - City"
        ],
        "South Korea": [
            "Busan",
            "Changwon",
            "Daegu",
            "Daejeon",
            "Gwangju",
            "Seoul",
            "Ulsan"
        ],
        "Sri Lanka": [
            "Colombo"
        ],
        "Taiwan": [
            "Hsinchu",
            "Kaohsiung",
            "Taichung",
            "Tainan",
            "Taipei"
        ],
        "Tajikistan": [
            "Dushanbe"
        ],
        "Thailand": [
            "Bangkok"
        ],
        "Turkmenistan": [
            "Ashgabat"
        ],
        "Uzbekistan": [
            "Tashkent"
        ],
        "Vietnam": [
            "Can Tho",
            "Da Nang",
            "Haiphong",
            "Hanoi",
            "Ho Chi Minh City"
        ]
    },
    "Europe": {
        "Albania": [
            "Tirana"
        ],
        "Armenia": [
            "Yerevan"
        ],
        "Austria": [
            "Graz",
            "Linz",
            "Vienna"
        ],
        "Belarus": [
            "Gomel",
            "Minsk"
        ],
        "Belgium": [
            "Antwerp",
            "Brussels",
            "Charleroi",
            "Gent",
            "Liege"
        ],
        "Bosnia and Herzegovina": [
            "Sarajevo"
        ],
        "Bulgaria": [
            "Plovdiv",
            "Sofia",
            "Varna"
        ],
        "Croatia": [
            "Zagreb"
        ],
        "Cyprus": [
            "Nicosia"
        ],
        "Czech Republic": [
            "Brno",
            "Ostrava",
            "Prague"
        ],
        "Denmark": [
            "Aarhus",
            "Copenhagen"
        ],
        "Estonia": [
            "Tallinn"
        ],
        "Finland": [
            "Helsinki",
            "Tampere"
        ],
        "France": [
            "Bordeaux",
            "Caen",
            "Clermont-Ferrand",
            "Dijon",
            "Grenoble",
            "Lille",
            "Lyon",
            "Marseille",
            "Montpellier",
            "Nancy",
            "Nantes",
            "Nice",
            "Orleans",
            "Paris",
            "Rennes",
            "Rouen",
            "Saint-Etienne",
            "Strasbourg",
            "Toulon",
            "Toulouse",
            "Tours"
        ],
        "Georgia": [
            "Tbilisi"
        ],
        "Germany": [
            "Aachen",
            "Augsburg",
            "Berlin",
            "Bonn",
            "Braunschweig-Salzgitter Wolfsburg",
            "Bremen",
            "Cologne",
            "Dresden",
            "Dusseldorf",
            "Erfurt",
            "Frankfurt am Main",
            "Freiburg im Breisgau",
            "Halle an der Saale",
            "Hamburg",
            "Hanover",
            "Karlsruhe",
            "Kiel",
            "Leipzig",
            "Mainz",
            "Mannheim-Ludwigshafen",
            "Muenster",
            "Munich",
            "Nuremberg",
            "Ruhr",
            "Stuttgart",
            "Wiesbaden"
        ],
        "Greece": [
            "Athens",
            "Thessaloniki"
        ],
        "Hungary": [
            "Budapest"
        ],
        "Iceland": [
            "Reykjavik"
        ],
        "Ireland": [
            "Dublin"
        ],
        "Italy": [
            "Bari",
            "Bergamo",
            "Bologna",
            "Catania",
            "Florence",
            "Genoa",
            "Milan",
            "Naples",
            "Padua",
            "Palermo",
            "Rome",
            "Turin",
            "Venice",
            "Verona"
        ],
        "Latvia": [
            "Riga"
        ],
        "Lithuania": [
            "Vilnius"
        ],
        "Luxembourg": [
            "Luxembourg - City"
        ],
        "Malta": [
            "Valletta"
        ],
        "Moldova": [
            "Chi\u015fin\u0103u"
        ],
        "Montenegro": [
            "Podgorica"
        ],
        "Netherlands": [
            "Amsterdam",
            "Eindhoven",
            "Groningen",
            "Rotterdam",
            "The Hague",
            "Utrecht"
        ],
        "North Macedonia": [
            "Skopje"
        ],
        "Norway": [
            "Bergen",
            "Oslo"
        ],
        "Poland": [
            "Bialystok",
            "Bydgoszcz",
            "Gdansk",
            "Katowice",
            "Kracow",
            "Lodz",
            "Lublin",
            "Poznan",
            "Szczecin",
            "Warsaw",
            "Wroclaw"
        ],
        "Portugal": [
            "Lisbon",
            "Porto"
        ],
        "Romania": [
            "Bucharest",
            "Iasi"
        ],
        "Russia": [
            "Astrakhan",
            "Barnaul",
            "Chelyabinsk",
            "Ekaterinburg",
            "Irkutsk",
            "Izhevsk",
            "Kazan",
            "Khabarovsk",
            "Krasnodar",
            "Krasnoyarsk",
            "Lipetsk",
            "Makhachkala",
            "Moscow",
            "Nizhniy Novgorod",
            "Novokuznetsk",
            "Novosibirsk",
            "Omsk",
            "Orenburg",
            "Penza",
            "Perm",
            "Rostov-on-Don",
            "Ryazan",
            "Samara",
            "Saratov",
            "St Petersburg",
            "Tomsk",
            "Tula",
            "Tyumen",
            "Ufa",
            "Ulyanovsk",
            "Vladivostok",
            "Volgograd",
            "Voronezh",
            "Yaroslavl"
        ],
        "Serbia": [
            "Belgrade"
        ],
        "Slovakia": [
            "Bratislava"
        ],
        "Slovenia": [
            "Ljubljana"
        ],
        "Spain": [
            "A Coruna",
            "Alicante",
            "Barcelona",
            "Bilbao",
            "Granada",
            "Las Palmas",
            "Madrid",
            "Malaga",
            "Murcia",
            "Palma de Mallorca",
            "Santa Cruz de Tenerife",
            "Seville",
            "Valencia (Spain)",
            "Valladolid",
            "Vigo",
            "Zaragoza"
        ],
        "Sweden": [
            "Gothenburg",
            "Malmo",
            "Stockholm"
        ],
        "Switzerland": [
            "Basel",
            "Bern",
            "Geneva",
            "Lausanne",
            "Zurich"
        ],
        "Turkey": [
            "Adana",
            "Adapazar\u0131",
            "Ankara",
            "Antalya",
            "Batman",
            "Bursa",
            "Denizli",
            "Diyarbakir",
            "Gaziantep",
            "Istanbul",
            "Izmir",
            "Kahramanmaras",
            "Kayseri",
            "Konya",
            "Malatya",
            "Samsun"
        ],
        "Ukraine": [
            "Dnipro",
            "Kharkiv",
            "Kyiv",
            "Lviv",
            "Mykolaiv",
            "Odesa",
            "Zaporizhzhia"
        ],
        "United Kingdom": [
            "Aberdeen",
            "Belfast",
            "Birmingham (UK)",
            "Bournemouth",
            "Brighton and Hove",
            "Bristol",
            "Cambridge",
            "Cardiff",
            "Coventry",
            "Derby",
            "Edinburgh",
            "Glasgow",
            "Kingston upon Hull",
            "Leeds",
            "Leicester",
            "Liverpool",
            "London",
            "Manchester",
            "Newcastle upon Tyne",
            "Northampton",
            "Nottingham",
            "Oxford",
            "Portsmouth",
            "Sheffield",
            "Southampton"
        ]
    },
    "Middle East": {
        "Bahrain": [
            "Manama"
        ],
        "Iran": [
            "Ahvaz",
            "Esfahan",
            "Kerman",
            "Kermanshah",
            "Mashhad",
            "Orumiyeh",
            "Qom",
            "Rasht",
            "Shiraz",
            "Tabriz",
            "Tehran",
            "Zahedan"
        ],
        "Iraq": [
            "Baghdad"
        ],
        "Israel": [
            "Haifa",
            "Jerusalem",
            "Tel Aviv"
        ],
        "Jordan": [
            "Amman"
        ],
        "Kuwait": [
            "Kuwait City"
        ],
        "Lebanon": [
            "Beirut"
        ],
        "Oman": [
            "Muscat"
        ],
        "Qatar": [
            "Doha"
        ],
        "Saudi Arabia": [
            "Dammam",
            "Jeddah",
            "Mecca",
            "Medina",
            "Riyadh"
        ],
        "UAE": [
            "Abu Dhabi",
            "Dubai-Sharjah-Ajman"
        ]
    },
    "Oceania": {
        "Australia": [
            "Adelaide",
            "Brisbane",
            "Canberra",
            "Melbourne",
            "Perth",
            "Sydney"
        ],
        "Fiji": [
            "Suva"
        ],
        "New Zealand": [
            "Auckland",
            "Christchurch",
            "Wellington"
        ],
        "Papua New Guinea": [
            "Port Moresby"
        ]
    }
}