Perplex Ridge is a ridge, rising over 915 m, composed of four rocky masses separated by small glaciers, extending 6 nautical miles (11 km) northeastward from Lainez Point

Lainez Point

Lainez Point is a point which forms the north side of the entrance to Dalgliesh Bay on the west side of Pourquoi Pas Island, off the west coast of Graham Land. It was discovered by the French Antarctic Expedition under Charcot, 1908–10, and named by him for Manuel Lainez, senator of the Argentine...

 along the northwest side of Pourquoi Pas Island

Pourquoi Pas Island

Pourquoi Pas Island is a mountainous island, long and from wide, lying between Bigourdan Fjord and Bourgeois Fjord off the west coast of Graham Land. It was discovered by the French Antarctic Expedition under Charcot, 1908-10...

, off the west coast of 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...

. First sighted and roughly charted in 1909 by the French Antarctic Expedition

French Antarctic Expedition

French Antarctic Expedition refers to several French expeditions in Antarctica.-First expedition:Yves-Joseph de Kerguelen-Trémarec was a French explorer....

 under Charcot. It was surveyed in 1936 by the British Graham Land Expedition

British Graham Land Expedition

A British expedition to Graham Land led by John Lachlan Cope took place between 1920 and 1922. The British Graham Land Expedition was a geophysical and exploration expedition to Graham Land in Antarctica between 1934 to 1937. Under the leadership of John Riddoch Rymill, the expedition spent two...

 (BGLE) and in 1948 by the Falkland Islands Dependencies Survey (FIDS). So named by FIDS because of confusion in attempting to identify this ridge from earlier maps.