The Demonweb Pits (or simply the Demonweb) is the realm of Lolth, the Demon Queen of Spiders, catalogued as the 66th layer of the Abyss. She shares them with her grandson Selvetarm and her consort Keptolo.
Sources:
Module Q1: Queen of the Demonweb Pits
Dungeon #84, "The Harrowing."
"Vault of the Drow," by Fred Weining. Living Greyhawk Journal #14 (August 2002)
Demihuman Deities
Dragon #279, "Revenge of the Spider Queen"
Queen of the Demonweb Pits (novel) by Paul Kidd
Fiendish Codex I: Hordes of the Abyss
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