Skullport

Skullport (also known as the Port of Shadows) was a teeming hive of evil lying deep beneath Waterdeep on the third underground level of Undermountain.

Sargauth
Skullport lies along the subterranean river Sargauth, used as a trade route to the outside world. Over the centuries, several portals large enough for entire ships to pass through have been built in the cavern walls along this waterway. One such portal, about 400 feet (122m) east of Skull Island, is only faintly visible as a scratched outline in the stone. Triggering the portal requires no special key, just extraordinary confidence on the part of the ship's pilot, since the vessel must be steered bow-first into the wall. When the bowsprit makes contact with the portal, the vessel and all its contents are transported instantly to the middle of the Lapal Sea.

Inhabitants
Considered part of the Underdark, it is a lawless place of slave traders, pirates, and demi-humans, which traffic with illithids, drow, beholders and other less savory creatures beneath the surface.

Notable inhabitants

 * Zstulkk Ssarmn
 * Nhyris D'Hothek

Snake Pit
The Snake Pit is located in the heart of Skullport's mercantile district, among the stone columns of the lower Trade Lanes, among the homes and taverns. Its walls are carved with images of serpents and scales, and two powerfully muscled, snake-tailed yuan-ti stand guard at its gates. It is the residence of Zstulkk Ssarmn, a prominent slaver of the Iron Ring consortium.

Inside Zstulkk's mansion, a coiled ramp leads down into the stone below. At its bottom lies a cavern lit with lurid red flame. This cavern is the terminus of the skull-shaped portal in the tail of the Great Petrified Serpent that lies in the Serpent Hills. The cavern houses the temple where Zstulkk Ssarmn leads his yuan-ti brood in worship of Sseth.