Elvenking's Halls
From Tolkien Gateway
Thranduil's halls, is the name given to the cave system in northern Mirkwood, which the Elves of Mirkwood lived during most of the Third Age and Fourth Age.
Thranduil's halls, is the name given to the cave system in northern Mirkwood, which the Elves of Mirkwood lived during most of the Third Age and Fourth Age.