Burning Lands Cluster (Endhaven Supplement)
From D&D Wiki
The Burning Lands are dominated by the Elemental Plane of Fire. The outer lands hot, dry lands. The further that you go into these lands, the hotter and more inhospitable the lands grow.
The Burning Lands is mostly void of life, with pockets of fire creatures and other beings acclimated to extreme heat. These creatures include wild fire elementals, fire giants, red dragons, salamanders, and cultists of Plasm