On the Alaska-Canada boundary about 3 mi E of the point at which the Kelsall River Crosses the boundary, 2.6 mi. NW of Hiteshitak Mtn. and 33 mi. NW of Skagway, St. Elias Mts.
Named by the United States and Canada in 1927 for R. N. Ashmum, employed by U.S. section of the International Boundary Commission (IBC).
Mount Ashmun, Mount Cheetdeekahyu, Chilkat Peak, Four Winds Mountain, Hiteshitak Mountain, Mount Prinsep, Mount Seltat, Surgeon Mountain, Tohitkah Mountain,
Rivers:Flemmer River, Kelsall River, Tahini River,
Streams:37 Mile Creek, Bear Creek, Big Boulder Creek, Glacier Creek, Jarvis Creek, Little Boulder Creek, Muncaster Creek, Nataga Creek, Porcupine Creek, Rosaunt Creek,
Valleys:Cities: