Lassus Mountains are mountains, 15 nautical miles (28 km) long and 3 nautical miles (6 km) wide, rising to 2,100 m and extending south from Palestrina Glacier

Palestrina Glacier

Palestrina Glacier is a glacier in the north part of Alexander Island, 11 nautical miles long and 8 nautical miles wide, flowing west from Nichols Snowfield into Lazarev Bay. Mapped from air photos taken by the Ronne Antarctic Research Expedition , 1947–48, by Searle of the Falkland Islands...

 in the northwest part of Alexander Island

Alexander Island

Alexander Island or Alexander I Island or Alexander I Land or Alexander Land is the largest island of Antarctica, with an area of lying in the Bellingshausen Sea west of the base of the Antarctic Peninsula, from which it is separated by Marguerite Bay and George VI Sound. Alexander Island lies off...

. First seen in 1821 by the Russian expedition under Bellingshausen. Photographed from the air 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) but mapped as part of the Havre Mountains

Havre Mountains

Havre Mountains are mountains forming the northwest extremity of Alexander Island, extending 20 nautical miles in an east-west direction between Cape Vostok and Russian Gap. First seen in 1821 by a Russian expedition under Bellingshausen and resighted by the Belgian Antarctic Expedition, 1897-99...

. First mapped in detail from air photos taken by the Ronne Antarctic Research Expedition

Ronne Antarctic Research Expedition

The Ronne Antarctic Research Expedition was an expedition from 1947-1948 which researched the area surrounding the head of the Weddell Sea in Antarctica.-Background:...

 (RARE), 1947–48, by Searle of the Falkland Islands Dependencies Survey (FIDS) in 1960. Named by United Kingdom Antarctic Place-Names Committee (UK-APC) after Orlandus Lassus (about 1532-94), Belgian composer.