Heard Island and McDonald Islands topographic map
Click on the map to display elevation.
About this map
Name: Heard Island and McDonald Islands topographic map, elevation, terrain.
Average elevation: 12 m
Minimum elevation: -1 m
Maximum elevation: 2,608 m
Heard Island, by far the largest of the group, is a 368-square-kilometre (142 sq mi) mountainous island covered by 41 glaciers (the island is 80% covered with ice) and dominated by the Big Ben massif. It has a maximum elevation of 2,745 metres (9,006 ft) at Mawson Peak, the historically active volcanic summit of Big Ben, to which the average ascent from shore is steeper than that for any island of comparable size or larger; only seven smaller islands are steeper. A July 2000 satellite image from the University of Hawaii's Institute of Geophysics and Planetology (HIGP) Thermal Alert Team showed an active 2-kilometre-long (1.2 mi) and 50- to 90-metre-wide (164–295 ft) lava flow trending south-west from the summit of Big Ben.
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