via:geojson.io

map.geojson

{
    "type": "FeatureCollection",
    "features": [
        {
            "type": "Feature",
            "properties": {
                "name": "Spain"
            },
            "geometry": {
                "type": "Polygon",
                "coordinates": [
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                            29.22889003019423
                        ],
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                        ],
                        [
                            16.5234375,
                            47.27922900257082
                        ],
                        [
                            16.5234375,
                            29.22889003019423
                        ],
                        [
                            -17.9296875,
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                        ]
                    ]
                ]
            }
        }
    ]
}