Kautha is a salt water marsh south of Ugidreth. The marsh is home to nothing but wretched creatures - undead lake monsters, crimson deaths, will-o-wisps, and a large number of undead. Many of these undead are remnants of when the Black Tide had their capital at Ugidreth.
Near the heart of the area is a partially submerged pyramid. This massive structure is Hells Pyramid of Power. When it was built in this area, the marsh was further west and then of no threat. By the First Epoch, the marsh had pushed past the pyramid, flooding several of its lower levels.