Point of Interest not opening (The Witcher 3: Wild Hunt)

Maybe you need to inspect the area with a sense of flair?

Fatum Sibir
tried, and ran and jumped, and by instinct - nothing came out (((

Aleksey Ku
It seems to have come, dive into the water, perhaps there will be an entrance from an underwater cave.

Fatum Sibir
searched in the water and in the area - no caves (I even restarted the game in the hope of a bug.

Aleksey Ku
Hmm, I wonder if I'll look for this place myself at home, is it in the order?

Fatum Sibir
West of the main Skellige Island, between Urskar Village and Dorve Ruins.

Well? Nobody knows the solution? Help who than can)