Heads on the north slope of the Brooks Range, Romanzof Mountains at 690300N, 1432600W, and flows N and NW to Beaufort Lagoon, W of Egaksrak River, 22 mi. NW of Demarcation Point, Arctic Plain. 75 miles long.
Eskimo name, Aichillik, recorded in 1918 by Leffingwell (1919, p. 93) who wrote spelled Aitshillik by Jenness.
Beaufort Lagoon, Egaksrak Lagoon, Nuvagapak Lagoon,
Capes:Channels:Egaksrak Entrance, Siku Entrance,
Rivers:Aichilik River, Egaksrak River, Ekaluakat River, Kogotpak River, Matsutnak River, Siksikpalak River,
Streams: