heads at Klak Lake, flows NW 16 mi. to Kancktok River, 55 mi. NE of Goodnews; Kilbuck-Kuskokwim Mts.
Eskimo name shown on an 1898 fieldsheet by W. S. Post, U.S. Geological Survey (USGS), as "Chlach River," but was published as "Klak Creek" by J. E. Spurr (1900, map 10).