The Darklakes

The Darklakes are actually a series of flooded caves connected by short, sloped tunnels. Some portions of the area are vast and open, spanning dozens of miles at a stretch. Hundreds of years ago, the dwarves of Doregul widened many of the tunnels and built a series of locks into them, allowing all the caverns to be traversed by large, shallowkeel boats.
Because of their proximity to Citadel Sigmifell and Deepburrow, the Darklakes have become a highway for trade in the area. The dwarven citadel of Sigmifell sits near the northwest shore of the Darklakes. Deepburrow lies about 30 miles west of them and about 2 miles above, but several well traveled paths descend from the gnomish town to the lakes' shores.
The Darklakes get their name from the unnatural darkness of their waters. Magical light sources cannot penetrate the depths to more than 10 feet, and even darkvision doesn’t help (treat the waters as a deeper darkness spell). The ceiling above the lakes are generally about 30 feet above the waterline, although in some caves the ceilings are as high as 300 feet, and in others it hangs as low as 5 feet.
A number of kuo-toas run a ferry service around the Darklakes, primarily between Citadel Sigmifell and docks near Deepburrow. They also put in at other ports in the Undermountain and make infrequent stops around the edges of the lakes near inhabited areas. No one knows where these kuo-toas come from, but their service is reliable and reasonably priced, and they avoid becoming entangled in events that are not their business.
The lakes waters are safe to drink after purification, but swimming in the Darklakes is not advisable because of the creatures that reside in its depths.

Type

Cave System

Location under

Undermountain