Aelinthaldaar

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

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

A magical effect, or mythal known as the Melairshield, 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.