Mount Breaker is a mountain with double summits, the eastern summit being, at 880 metres (2,887.1 ft), the highest on Horseshoe Island

Horseshoe Island (Antarctica)

Horseshoe Island is an island 6.5 nautical miles long and 3 nautical miles wide occupying most of the entrance to Square Bay, along the west coast of Graham Land. Discovered and named by the British Graham Land Expedition under Rymill who mapped this area by land and from the air in 1936-37...

, off Graham Land

Graham Land

Graham Land is that portion of the Antarctic Peninsula which lies north of a line joining Cape Jeremy and Cape Agassiz. This description of Graham Land is consistent with the 1964 agreement between the British Antarctic Place-names Committee and the US Advisory Committee on Antarctic Names, in...

. The name was given by the United Kingdom Antarctic Place-Names Committee in 1958 and is descriptive; the two summits are separated by a shallow col and, when seen from the west, resemble a breaking wave.