between Ernie Creek and North Fork Koyukuk River, 27 mi. E of Anaktuvuk Pass, Brooks Range
Named in 1930 by Marshall (1956, p. 122) for his companion, Al Retzlaf, who shot two Dall sheep on this mountain.
East Alapah Glacier, West Alapah Glacier,
Lakes:Mountains:Alapah Mountain, Als Mountain, Blackface Mountain, Cockedhat Mountain, Mount Doonerak, Hanging Glacier Mountain, Inclined Mountain, Limestack Mountain, Marshmallow Mountain, Midnight Mountain, North Peak, Twoprong Mountain, Wien Mountain,
Mountain Passes:Gates of the Arctic, Holmes Pass, Peregrine Pass,
Streams:Alinement Creek, Amawk Creek, Bombardment Creek, Ernie Creek, Grizzly Creek, Irish Creek, Kachwona Creek, Kenunga Creek, Pyramid Creek, Saint Patricks Creek, Shushalluk Creek, Tributary Creek,
Valleys: