Mount Sidley

Mount Sidley is the highest dormant volcano in Antarctica, a member of the Volcanic Seven Summits, the highest volcanoes on each of the seven continents, with a summit elevation of 4,181–4,285 metres (13,717–14,058 ft).^[1][2] It is a massive, mainly snow-covered shield volcano, which is the highest of the five volcanoes that comprise the Executive Committee Range of Marie Byrd Land. The feature is marked by a 5-kilometre-wide (3.1 mi) caldera^[3] on the southern side and stands northeast of Mount Waesche in the southern part of the range.

Mount Sidley
Aerial view of the Mount Sidley caldera from the southwest
Highest point
Elevation	4,285 m (14,058 ft)[1][2]
Prominence	2,517 m (8,258 ft)[1]
Listing	Volcanic Seven Summits, Ultra, Ribu
Coordinates	77.04°S 126.10°W / -77.04; -126.10[1]
Geography
Mount Sidley Antarctica
Location	Marie Byrd Land, Antarctica
Parent range	Executive Committee Range
Geology
Mountain type	Shield volcano
Volcanic field	Marie Byrd Land Volcanic Province
Climbing
First ascent	1990 by Bill Atkinson (New Zealand)

The mountain was discovered by Rear Admiral Richard E. Byrd on an airplane flight, on November 18, 1934, and named by him for Mabelle E. Sidley, the daughter of William Horlick who was a contributor to the 1933–1935 Byrd Antarctic Expedition.^[4] Despite its height, the volcano's extremely remote location means that it is little known even in the mountaineering world compared to the much more accessible Mount Erebus, the second-highest Antarctic volcano which is located near the U.S. and New Zealand bases on Ross Island.

The first recorded ascent of Mount Sidley was by New Zealander Bill Atkinson on January 11, 1990, whilst working in support of a United States Antarctic Program scientific field party.^[5]

Topographic map of Mounts Sidley and Waesche (1:250,000 scale)

Landsat 8 image of Mount Sidley and the Executive Committee Range

See also

• List of volcanoes in Antarctica