The northern and northwest side of the range is drained by tributaries of the Cottonwood River; the southern and southwestern flank is formed by Tuya Lake and its tributary, Butte Creek, while the southeast flank is formed by the Cottonwood River and its tributaries (the Cottonwood is a tributary of the Dease River, the Tuya of the Stikine). The range's northern boundary is formed by the upper Jennings River, a tributary of the Teslin River system which is part of the Yukon River drainage. Thus, the triple divide between the Mackenzie, Stikine, and Yukon River basins lies within the range. The Continental Divide transits the eastern side of the range, though does not touch on its highest summit, Ash Mountain, which is at the north end of the range and is within the basin of the Jennings. The range has an area of and, other than Ash Mountain, includes Tuya Butte, Mathews Tuya, Caribou Tuya, and South Tuya. All of these are part of the Tuya Volcanic Field, which includes other volcanic features north and west of the range