Hi @Manuel_Martin,
I’m afraid I have no idea why geojson.io is giving you those numbers! I’ve just created a similar polygon and got the following numbers:
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
3.8891601562499996,
42.47209690919285
],
[
-3.0322265625,
43.691707903073805
],
[
-10.70068359375,
44.37098696297173
],
[
-10.56884765625,
35.871246850027966
],
[
-1.1865234375,
36.13787471840729
],
[
4.81201171875,
39.842286020743394
],
[
3.8891601562499996,
42.47209690919285
]
]
]
}
Hope this helps!
Mark