Aelinthaldaar

Aelinthaldaar was the capital of Illefarn, an ancient elven civilization in northwest Faerûn. The city was located where Waterdeep later stood.

History
The elves destroyed their own city in -1100 DR when they retreated to Evermeet, leaving very little behind.

A magical effect that prevented the plateau from collapsing, regardless of activities below the surface, remained in effect. Crypts remained intact below the Pantheon Temple of the Seldarine in Waterdeep.