The Moondeep Sea was a subterranean lake approximately 240 miles (386 km) wide found in the Underdark beneath the Galena Mountains.[1]


The cavern which contained it was known as the Vault of Gnashing Teeth, so named for the countless animated skulls stuck to the cavern's ceiling.[1]

The Moondeep Sea was known for its giant aquatic spiders and the city of V'elddrinnsshar‎, which lay on a mile-wide island dominated by a plateau in the middle of the lake.[1]



  1. 1.0 1.1 1.2 1.3 1.4 Eric L. Boyd (1998). Demihuman Deities. (Wizards of the Coast), p. 26. ISBN 0-7869-1239-1.