The Tourmaline Depths were a subterranean complex beneath the city of Baldur's Gate that served as the headquarters of Cazador Szarr, the city's master vampire. The Depths were possibly built in antiquity by dwarven refugees fleeing the fall of Bhaerynden, likely as a mine or outpost of sorts.
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https://forgottenrealms.fandom.com/wiki/Tourmaline_Depths