heads in Kuskokwim Mts. and flows NW to Aniak River 18 mi. SE of Aniak, Yukon-Kuskokwim Delta. 33 miles long.
Local name reported by U.S. Geological Survey (USGS) in 1919; derived from the Eskimo word reported to be "buksta(k)" meaning "swampy river." There is a Doestock Creek 15 miles to the north.