Mount Dumais is a bluff-type mountain

Mountain

Image:Himalaya_annotated.jpg|thumb|right|The Himalayan mountain range with Mount Everestrect 58 14 160 49 Chomo Lonzorect 200 28 335 52 Makalurect 378 24 566 45 Mount Everestrect 188 581 920 656 Tibetan Plateaurect 250 406 340 427 Rong River...

, 1,830 m, standing on the southwest edge of Mackin Table

Mackin Table

Mackin Table is an ice-topped, wedge-shaped plateau, about 20 nautical miles long, standing just north of Patuxent Ice Stream in the Patuxent Range, Pensacola Mountains. Mapped by United States Geological Survey from surveys and U.S. Navy air photos, 1956-66. Named for J. Hoover Mackin,...

, 2 nautical miles (3.7 km) north of Lekander Nunatak

Lekander Nunatak

Lekander Nunatak is a nunatak, 1,815 m, standing along the southwest edge of Mackin Table, 2 nautical miles northeast of Bessinger Nunatak, in southern Patuxent Range, Pensacola Mountains. Mapped by United States Geological Survey from surveys and U.S. Navy air photos, 1956-66. Named by Advisory...

, in southern Patuxent Range

Patuxent Range

The Patuxent Range is a major range of the Pensacola Mountains, comprising the Thomas Hills, Anderson Hills, Mackin Table and various nunataks and ridges bounded by the Foundation Ice Stream, Academy Glacier and the Patuxent Ice Stream. Discovered and partially photographed on January 13, 1956 in...

, Pensacola Mountains

Pensacola Mountains

The Pensacola Mountains are a large group of mountain ranges and peaks in Antarctica, extending 450 km in a NE-SW direction, comprising the Argentina Range, Forrestal Range, Dufek Massif, Cordiner Peaks, Neptune Range, Patuxent Range, Rambo Nunataks and Pecora Escarpment...

. Mapped by United States Geological Survey

United States Geological Survey

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology,...

 (USGS) from surveys and U.S. Navy air photos, 1956-66. Named by Advisory Committee on Antarctic Names

Advisory Committee on Antarctic Names

The Advisory Committee on Antarctic Names is an advisory committee of the United States Board on Geographic Names responsible for recommending names for features in Antarctica...

 (US-ACAN) for Lieutenant Clarence C. Dumais (MC) U.S. Navy, officer in charge of South Pole Station, winter 1960.