water passage in Yukon Delta, flows NE 30 mi. from Kwikpak Pass to Pastol Bay, 41 mi. NE of Kwiguk; Yukon-Kuskokwim Delta.
Eskimo name published by Captain Tebenkov (1852, map 2), Imperial Russian Navy (IRN), as "Prot(oka) Abkhun," or "Abkhun Watercourse." William Hamilton, U.S. Bureau of Education, "The natives compared the delta of the Uykon with its mouths to a human hand and have given the name 'Aphoon' (thumb) to its northernmost channel" (Baker, 1906, p. 103).