approx. 360 mi. long; heads in the Brooks Range in the Arctic National Wildlife Refuge 6 mi. SE of Cloud, flows generally S into Teedriinjik River), 2 mi. SSW of Mary Lake; Tps27-32N, Rgs3&4,2&1W, Tps32&33N, R1E, Tps33-37N, R1W, Fairbanks Meridian and Tps16-13S, Rgs19-17E, Umiat Meridian
The name is from the Gwichâ€™in language and means â€œheart riverâ€.