The Kingdom of Skyy
Drow are a decadent race of dark elves whose beauty and sophistication fail to mask hearts all too often stained in evil. The vast majority of dark elves base their behavior and attitudes on the worship of The Black Cult. Drow society is organized into houses. The heads of the most powerful houses occupy leadership positions in the various cities of the Underdark, the subterranean realm beneath the world’s surface that the dark elves call home.
Source: Forgotten Realms Player’s Guide