Deeping Steppes as named by Dargain the Gnomish adventurer who happened upon this place when attempting to find lost friends in a nearby series of caves and was swept in by the unexpected surge of an underground river, perhaps due to shifting of plates or erosion of a natural barrier. The cavern was sealed and unknown until being discovered by Dargain.

This is a region of the underdark where a series of very large plateaus occupy a huge underground cavern. The cavern is situated near a very common and sometimes treacherous underdark route know as The Underway (in my version of the world) which reaches from the Dales to Silverymoon regions in the Forgotten Realms.

The lake of rage is just a lake, save for it's dark powerand the dark tale that gave birth to it

The ruins of the lands that bore the confrontation between the Mad God of Avarice and the Storm Queen, this place has been soaked by the divine essence of two of the most chaotic gods.