flows SE to Goodnews River, 13 mi. NE of Goodnews, Kilbuck-Kuskokwim Mts. 13 miles long.
Name reported in 1919 by G. L. Harrington (in Brooks and others, 1921, pl. 7), U.S. Geological Survey (USGS). Its Eskimo name is "Avgun," meaning "dividing" and is similar to "Avan" found in the north.
Atamautsitlguar Mountain, Chawekat Mountain, Dome Mountain, Explorer Mountain, Flat Mountain, Ikuktlitlig Mountain, Island Mountain, Kisogle Mountain, Kiugtlugtulit Mountain, Knight Mountain, Lookout Mountain, Mitlak Mountain, Nagotligageivik Mountain, Sugtutlig Mountain, Tatlignagpeke Mountain, Tgolik Mountain, Tigyukauivet Mountain,
Barnum Creek, Camp Creek, Cascade Creek, Casino Creek, Colorado Creek, Crater Creek, Domingo Creek, Dry Creek, Granite Creek, Native Creek, Olympic Creek, Puyulik Creek, Slate Creek, Tivyagak Creek, Ukfigag Creek, Velvet Creek, Wattamuse Creek,