City in Xaintongeais and target of a Turntable Family expedition through the Underway that will start in a recently discovered entrance near Galdurok.

Dorin'Sur was a dwarven hold built on the coast of a massive glacial lake, and has access to two large caverns, one filled with sparkling gems and used as the artisan quarter of the city called the Geode District and the other filled with lush, almost tropical plant life directly under the lake called the Underlake Jungle, which is left unspoiled as a nature preserve and strictly policed hunting grounds. On the far side of the Underlake cavern is a gate to the Underway that seems to be locked from the other side.