135 miles long, it flows west from glaciers in the Endicott Mountains changing direction just north of Anaktuvuk Pass Porter, Stephen C. (1966) Pleistocene geology of Anaktuvuk Pass, Central Brooks Range, Alaska (Arctic Institute of North America Technical Paper #18) Arctic Institute of North America, Washington D.C., page 12, 17327 to flow north to the Arctic Coastal Plain where it joins the Colville River.