Backstairs Passage Glacier (75°2′S 162°36′E) is a glacier

Glacier

A glacier is a large persistent body of ice that forms where the accumulation of snow exceeds its ablation over many years, often centuries. At least 0.1 km² in area and 50 m thick, but often much larger, a glacier slowly deforms and flows due to stresses induced by its weight...

 about 2 miles (3 km) long, draining east along the north side of Mount Crummer

Mount Crummer

Mount Crummer is a massive, brown granite mountain, 895 m, immediately south of Backstairs Passage Glacier on the coast of Victoria Land. First charted and named by the British Antarctic Expedition, 1907–09, under Shackleton....

 to the Ross Sea

Ross Sea

The Ross Sea is a deep bay of the Southern Ocean in Antarctica between Victoria Land and Marie Byrd Land.-Description:The Ross Sea was discovered by James Ross in 1841. In the west of the Ross Sea is Ross Island with the Mt. Erebus volcano, in the east Roosevelt Island. The southern part is covered...

. The Magnetic Pole Party, led by Edgeworth David

Edgeworth David

Sir Tannatt William Edgeworth David KBE, DSO, FRS, was a Welsh Australian geologist and Antarctic explorer. A household name in his lifetime, David's most significant achievements were discovering the major Hunter Valley coalfield in New South Wales and leading the first expedition to reach the...

, of the British Antarctic Expedition, 1907–09, ascended this glacier from the Ross Sea, then continued the ascent via Larsen Glacier

Larsen Glacier

Larsen Glacier is a glacier flowing southeast from Reeves Neve, through the Prince Albert Mountains and entering the Ross Sea just south of Mount Crummer in Victoria Land. Discovered by the South Magnetic Party of the Shackleton expedition, 1907–09, who followed its course on their way to the...

 to the plateau of Victoria Land

Victoria Land

Victoria Land is a region of Antarctica bounded on the east by the Ross Ice Shelf and the Ross Sea and on the west by Oates Land and Wilkes Land. It was discovered by Captain James Clark Ross in January 1841 and named after the UK's Queen Victoria...

. So named by David's party because of the circuitous route to get to Larsen Glacier.