| Category | Lakes |
| Continent | Straiden |
| Region | Ikešai |
| Map | Anulu |
The Underdark hosts Fishur, a lake situated within Anulu. This body of water serves as the dwelling for an abundance of kuo-toa and scrags. Numerous denizens of these predatory species are citizens of Fongruk-Toa.
In the northernmost region of the lake, at a profound depth of 2,500 feet, lies the Murkin Channel. This intricate rift within the system serves as a vital conduit between the waters of Fishur and the distant surface lake known as Murkin. On the Murkin side, the rift also grants passage to the Underdark expanse of Garathral.