Masson Island
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Masson Island or Mission Island is an ice-covered island about 17 miles long and rising to 465 m, lying 9 miles northwest of Henderson Island within the Shackleton Ice Shelf. Masson Island is located at and has an elevation of 465 m. Masson Island was discovered in February 1912 by the Australian Antarctic Expedition under Sir Douglas Mawson, who named it for Professor Sir David Orme Masson of Melbourne, a member of the Australian Antarctic Expedition Advisory Committee.