Masson Island
Masson Island or Mission Island is an ice-covered island about long and rising to, lying northwest of Henderson Island within the Shackleton Ice Shelf. Masson Island is located in the western part of Mawson Sea at and has an elevation of. 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.