My data :
{{{GeoPosition[{36.867, 30.733}], {1}}, {GeoPosition[{36.274,
23.017}], {1}}, {GeoPosition[{36.667, -4.483}], {1}}, \
{GeoPosition[{38.176, 13.091}], {1}}, {GeoPosition[{36.405,
28.086}], {1}}}, {{GeoPosition[{41.283,
2.067}], {2}}, {GeoPosition[{44.413,
8.838}], {2}}, {GeoPosition[{43.658,
7.216}], {2}}, {GeoPosition[{42.74,
2.871}], {2}}, {GeoPosition[{41.8,
12.233}], {2}}, {GeoPosition[{39.489, -0.482}], {2}}}, \
{{GeoPosition[{41.133, 16.783}], {3}}, {GeoPosition[{40.977,
28.815}], {3}}, {GeoPosition[{43.45,
5.233}], {3}}, {GeoPosition[{43.684,
10.393}], {3}}, {GeoPosition[{40.52,
22.971}], {3}}, {GeoPosition[{42.367,
19.25}], {3}}}, {{GeoPosition[{45.677, 13.754}], {4}}}}