This is the tomb after the Cathedral of the Forsaken; the Three Fingers are way below.

You can skip to the bottom by using a critical attack on one of the mournful nomads, who play string instruments. Stance break them with, for example, a small shield, walk in front of them near the edge, and then crit them with your empty hand. During your critical attacks, you are entirely immune to damage, even fall damage. Also, the fall looks pretty cool; you just have to sacrifice one of the last survivors of the nomads at the site of their genocide…