Willett Range is the range extending north from Mistake Peak

Mistake Peak

Mistake Peak is a snowy peak, about 2,600 m, rising 3 nautical miles west-southwest of Shapeless Mountain, at the south end of the Willett Range in Victoria Land. So named in 1957 by the New Zealand Northern Survey Party of the Commonwealth Trans-Antarctic Expedition , because they mistakenly...

 and running for 20 nautical miles (37 km) as a high shelf along the edge of the continental ice to the Mackay Glacier

Mackay Glacier

Mackay Glacier is a large glacier in Victoria Land, descending eastward from the polar plateau, between the Convoy and Clare Ranges, into the southern part of Granite Harbour. Discovered by the South Magnetic Pole Party of the British Antarctic Expedition and named for Alistair F...

, in 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...

. The range is breached by several glaciers flowing east from the plateau. Named by the New Zealand Northern Survey Party of the Commonwealth Trans-Antarctic Expedition

Commonwealth Trans-Antarctic Expedition

The 1955–58 Commonwealth Trans-Antarctic Expedition was a Commonwealth-sponsored expedition that successfully completed the first overland crossing of Antarctica, via the South Pole...

 (1956–58) for R.W. Willett, Director of the New Zealand Geological Survey, who gave valuable assistance throughout the expedition and in the compilation stages after its return.