Mount Allan Thomson

Mackay Glacier (76°58′S 162°0′E) is a large glacier in Victoria Land, descending eastward from the Antarctic Plateau, between the Convoy Range and Clare Range, into the southern part of Granite Harbour. It was discovered by the South magnetic pole party of the British Antarctic Expedition, 1907–09, and named for Alistair Mackay, a member of the party. The glacier's tongue is called Mackay Glacier Tongue. Its mouth is south of the Evans Piedmont Glacier and the Mawson Glacier. It is north of the Wilson Piedmont Glacier and the Ferrar Glacier.

Neighbouring summits