69 ° 26' 48.001" N,
143 ° 0' 0" W
North Slope
1329 ft (405.08 m)
Heads at 690620N, 1422381W, flows NNW to Aichilik River, 37 km (23 mi) NE of Mount Hubley, Brooks Range
HistoryNamed for Ernest de Koven Leffingwell (1876-1971), polor explorer and geologist, who over a period of 9 years in the early 1900's explored and mapped the coastal area of northern Alaska.