McDonald Heights is a broad, ice‑covered elevated area in Marie Byrd Land, Antarctica. The heights form a gently sloping plateau that extends for several tens of kilometres along the coast of the Ross Sea, situated between the east side of the Haines Glacier and the western margin of the Siple Coast. The terrain consists predominantly of snow and glacial ice, rising to elevations of approximately 900 m (2,950 ft) above sea level.
Discovery and mapping
The region was first observed and photographed from the air during aerial surveys conducted by the United States Antarctic Service (USAS) in 1939–1941. Subsequent detailed mapping was carried out by the United States Geological Survey (USGS) using surveys and aerial photographs taken by the U.S. Navy’s Operation Highjump (1946–1947) and later reconnaissance flights. These efforts produced topographic maps that defined the extent and contours of McDonald Heights.
Naming
The name “McDonald Heights” was applied by the Advisory Committee on Antarctic Names (US‑ACAN). The precise individual for whom the feature was named has not been definitively recorded in the publicly available naming citations; consequently, the eponymous origin of the name remains uncertain.
Geography and significance
McDonald Heights lies within the coastal region of Marie Byrd Land that is characterized by a series of ice‑domed elevations and glaciers draining toward the Ross Sea. The plateau’s relatively gentle slope and exposed nunataks provide reference points for scientific expeditions traversing the otherwise featureless ice sheet. The area has been used as a baseline for glaciological studies, including measurements of ice thickness and flow dynamics in the surrounding glacier systems.
References
- United States Geological Survey (USGS) topographic maps of Marie Byrd Land, 1950s–1960s.
- Advisory Committee on Antarctic Names (US‑ACAN) gazetteer entries for Antarctic geographic features.
Note: While the existence and basic geographic characteristics of McDonald Heights are well documented in official US Antarctic cartographic sources, detailed historical information regarding the naming origin is limited.
