Big Ben is a volcanic massif that dominates the geography of Heard Island in the southern Indian Ocean. It is a composite cone with a diameter of approximately 25 kilometres. Its highest peak is Mawson Peak, which is 2,745 m above sea level. Much of it is covered by ice, including 14 major glaciers which descend from Big Ben to the sea. Big Ben is the highest mountain in Australian Territory, except for those claimed in the Australian Antarctic Territory. A smaller volcanic headland, the Laurens Peninsula, extends approximately 10 km to the northwest, created by a separate volcano, Mount Dixon; its highest point is Anzac Peak, at 715 m.
By elevation Big Ben is
# 6 out of 29 in Heard Island and McDonald Islands # 6 out of 21731 in Australia # 6 out of 29 in Heard and McDonald Islands World Heritage Area # 6 out of 29 in Heard Island and McDonald Islands Marine Reserve
By prominence Big Ben is
# 28 out of 29 in Heard Island and McDonald Islands # 28 out of 29 in Heard and McDonald Islands World Heritage Area # 28 out of 29 in Heard Island and McDonald Islands Marine Reserve
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