The Ederianai Chasms
The Ederianai Chasms are a network of chasms and clefts in the World Below Sayleen. The Chasms are not just clefts and breaches, however, but are a name designating the whole region which includes Igneous, Metamorphic, and Sedimentary stone caverns as well as a patch of the legendary Godstone. The Kingdom of Bolenvinnia dwells within the Chasms, home to the Chasm Demons of the world.
The Southern Wilds
The Southern Wilds is two distinct cavern structures spanning the southern half of Sayleen. The individual caves do not have special names only because they that live there do not care to name them, so the Hkahnihn simply know the place communally as the Southern Wilds. A nearly impassible stretch of Metamorphic stone splits the caverns in twain and acts as neutral territory for the denizens of the caves. Two of the Tribes of Abyssal Demons dwell on opposite sides of that divide.