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 . It has a maximum elevation of 2,745 metres (9,006 ft) at , the historically active volcanic summit of Big Ben, to which the average ascent from shore is steeper than that for any islan. .
赫德岛和麦克唐纳群岛（英语：Heard Island and McDonald Islands，：HIMI），无人居住的荒岛，1947年起纳入，1997年获选为（）。赫德岛以南约1600公里达边沿；除去南极洲和小于1000平公方公里的岛屿不算，赫德岛方圆3700公里内都是海洋，不见。赫德岛80%的陆地都为冰川覆盖，岛上拥有比较稀少.
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