It comprises a series of cascading waterfalls that empty from a lake in Gathbúrz into a river valley far below in the Ashenslades. The water in this cascade is thick, gloopy, and dark purple. Drinking its waters is presumably extremely hazardous. As the river below runs west, the toxic waters seep into the ground, withering grass and killing animals. It eventually gets dispersed into the waterways of the Drownholt before trickling out into the great Anduin.
The following creatures are found within Lagfaur-hah.