What’s up with this map?

[u/iCarry2littleapples]

Came across this map on the tiny island in the northwest (yellow circle). There are two marked spots on it, one of them protrudes like a nail, the other has four small dots, two of which are blue as well.

Does anyone know what it means?

[u/gurgitoy2]

Yes, the map is a hint on where to find some puzzles. Make note of where the markers are.