Mount Henderson is a massive mountain rising through the ice sheet 5 miles (8.0 km) southeast of Holme Bay and a like distance northeast of the north end of the Masson Range.

[4] Glacial erratic boulders of light-colored granitic gneiss cover the lower slopes of the mountain, but are not found more than about 250 metres (820 ft) above the present-day ice surface.

Buellia frigida is the most common lichen, extending deep into sheltered crevices between rocks in association with Xanthoria mawsonii and Protoblastenia citrina.

On the southeast corner of the massif there are dense cushions of Biatorella antarctica, which is also plentiful on the summit, as are Buellia frigida and Caloplaca elegans var.

[6] The lichen Gasparrinia harrisoni has been found growing on Mount Henderson less than 2 metres (6 ft 7 in) from the line where the ice meets the rock.

[7] Mount Henderson was seen for the first time from the crow's nest of the Discovery on 3 January 1930, during the British Australian and New Zealand Antarctic Research Expedition (BANZARE) (1929–31).

A bare rock hill, 840 metres (2,760 ft), standing 1 mile (1.6 km) south of Mount Henderson in the northeast part of the Framnes Mountains, Mac.

Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936-37, and named Sorkollen (the south knoll).