Mount Allsup is at its southern tip, at the southwest end of the Canopy Cliffs, which face the Law Glacier.

Named by US-ACAN for Clifford C. Allsup, Aviation Machinist's Mate, United States Navy, who was injured during Operation Deep Freeze II, 1956-57.

A descriptive name applied by the Northern Party of the New Zealand Geological Survey Antarctic Expedition (NZGSAE) (1961-62), suggesting the precipitous nature of the cliffs.

A mountain, 2,665 metres (8,743 ft) high, at the end of the rock spur running west from the Sandford Cliffs.

A rounded, mainly ice-covered mountain rising above the Peletier Plateau 4 nautical miles (7.4 km; 4.6 mi) northwest of Mount Ropar.

Named by NZGSAE (1961-62) because the pass was used by a Dakota R4D (new designation Skytrain C-47) plane on a reconnaissance flight into the area.