Smouldercrown Mountains

The Smoldercrown Mountains is volcanic range approximately 250 miles south of Ank’Harel where a hidden ziggurat served as a second portal for members of the Remnants to get into the Shadowfell. It is not yet completely clear whether the Suuthan Volcano mentioned in the CG is part of the Smoldercrown Mountains or whether is in a different southerly direction from Ank'Harel.

Notable Locations
Ziggurat: Scanlan Shorthalt and Lionel Gayheart discovered a ziggurat on the continent of Marquet, within the Smolder Crown Mountains. Here Delilah conducted a second, or possibly third, ritual for Vecna before Vox Machina could interfere.

Fauna
Some sort of "desert duck" was summoned by Lionel at one point to help them answer some of their questions, though it was uncertain whether such a species is normally prevalent in the Marquesian Desert.