What cave? And how to get it? (The Witcher 3: Wild Hunt)

try it on a boat there to sail,most likely the entrance from the shore

the entrance is under the water

the one in the cave that is marked on the map South of the player (in the second screenshot) is another cave, I ran it all and even comes close to this point.
as far as I can tell, the entrance to the cave, which I ask for a big mountain, but I ran around everywhere and do not have any inputs, even the cracks

a_Dieu
try using the free camera to look for input/output

just wanted to avoid any changes to the game (installing mods). but look, that no one except me will not help me

I flew there, the caves are a no-no.