between Mount Natazhat and Alaska-Canada boundary, N of Klutlan Glacier, 60 mi. NE of McCarthy, St. Elias Mts.
Named by the Alaska-Canada boundary surveyors, 1909-13, for Thomas Riggs, Jr., surveyor in charge for the United States.
Guerin Glacier, Klutlan Glacier, Natazhat Glacier,
Mountains:Peaks:Bruin Peak, The Cub, Kuma Peak, Oso Peak, Panda Peak, Polar Peak, Sow Peak,
Streams: