The Tumblestone River was a narrow river that originated in the hills north of the village of Arnglar in the Border Kingdoms and flowed roughly northeast through the realms of Middle Mukshar and Nether Mukshar until it reached the shores of the Lake of Steam, a total course of approximately 60 miles.
- ↑ 1.0 1.1 Ed Greenwood. The Border Kingdoms. Wizards of the Coast. Retrieved on 2014-09-13.
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