Claim: Antarctica's Mount Donaldson, discovered by the British Antarctic Expedition, is part of the Flat Top.
Evidence: Mount Donaldson () is a mountain, 3,930 m, standing 5 nautical miles (9 km) north-northeast of the summit of Flat Top and west of the head of Ludeman Glacier in the Commonwealth Range in Antarctica. Discovered and named by the British Antarctic Expedition (1907-09). It forms the northern end of the Flat Top massif.