Imladris, J.R.R. Tolkien’s name for Rivendell, is a Sindarin name.
Rivendell is the Common Speech name for the Elven refuge founded and ruled by Elrond. In Sindarin, the settlement is called Imladris, commonly interpreted as meaning “deep valley of the cleft.” The name reflects the location’s protected position in a steep valley east of the Misty Mountains.
Sindarin is one of Tolkien’s major Elvish languages. He based much of its sound and structure on Welsh, while Quenya was influenced strongly by Finnish and served as a more formal or ancient Elvish language. Tolkien sometimes supplied multiple names for the same place because Middle-earth contains several peoples and linguistic traditions.
Rivendell is important in The Hobbit and The Lord of the Rings. Bilbo stays there during his journey, and the Council of Elrond later decides the fate of the One Ring there.