flows SE to Matogak River, 1 mi. N of Hagemeister Strait and 9.4 mi. NW of Hagemeister I., Kilbuck-Kuskokwim Mts.
Local name obtained in 1948 from Frank Waskey, trader and prospector; and published in 1951 by U.S. Geological Survey (USGS). "Nisua" means "wheat (or wheat-roll)" in Finnish.