Green, red, grey islands. What does each colour mean?

[Espiovvv]

Hey, just wondering if green means explored, red means explored and had combat, and grey means unexplored. If not, what does each colour actually mean?

[mattlarrabee]

so for the fast travel points, green is complete (found all items), grey means discovered, red means undiscovered.

If you mean the islands themselves it just shows biome.

note that green is bugged right now if you haven't beat last boss, once you beat boss green is accurate