Unthalass

Unthalass was once the capital of Unther.

Notable Locations
Unthalass' undercity was the location of a secret temple to Tiamat. The area was home to wererats and lamias, led by a lamia noble named Ereshkigal.

History
At its peak, Unthalass was the greatest city in all of Faerûn, but a series of floods,  raids by pirates, and finally an epic confrontation between the two raging deities Gilgeam and Tiamat reduced its once grand status.