In the attached united-nations.json you will find a list of all regions/subregions of the world WITHOUT countries.
The map is based on the Wikipedia article
{
"Africa": [
"Eastern Africa",
"Middle Africa",
"Northern Africa",
"Southern Africa",
"Western Africa"
],
"Americas": [
"Latin America",
"Northern America"
],
"Latin America": [
"South America",
"Caribbean",
"Central America"
],
"North America": [
"Caribbean",
"Central America",
"Northern America"
],
"Asia": [
"Central Asia",
"Eastern Asia",
"Southern Asia",
"South-Eastern Asia",
"Western Asia"
],
"Europe": [
"Eastern Europe",
"Northern Europe",
"Southern Europe",
"Western Europe"
],
"Oceania": [
"Australia",
"New Zealand",
"Melanesia",
"Micronesia",
"Polynesia"
]
}