test

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -3.1640625,
              40.713955826286046
            ],
            [
              -3.1640625,
              55.178867663281984
            ],
            [
              11.6015625,
              47.040182144806664
            ],
            [
              20.7421875,
              55.178867663281984
            ],
            [
              20.7421875,
              40.713955826286046
            ],
            [
              -3.1640625,
              40.713955826286046
            ]
          ]
        ]
      }
    }
  ]
}