The Shackle Bridge in TESO.

The Shackle Bridge is a sub area, a bridge. This is just outside the Black Forge.

Vanus Galerion leads the Soulless One here after they free him. It is here he shows them the Great Shackle. This is the start point and the end point for the Planemeld. If the shackle is broken, the meld will end.