Rotunda Glacier is a tributary 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...

 flowing north between Ugolini Peak

Ugolini Peak

Ugolini Peak is a sharp rock peak, over 2,200 m, surmounting the central part of a large ice-free massif 6 miles south of Knobhead, at the south side of upper Ferrar Glacier in Victoria Land. Ugolini Ridge lies to its south east....

 and La Count Mountain

La Count Mountain

La Count Mountain is a mostly ice-free mountain forming the northern portion of Battleship , located between Rotunda Glacier, Blankenship Glacier, and Ferrar Glacier in Victoria Land...

 into upper Ferrar Glacier

Ferrar Glacier

The Ferrar Glacier is an Antarctic glacier about long, flowing from the plateau of Victoria Land west of the Royal Society Range to New Harbour in McMurdo Sound. The glacier makes a right turn northeast of Knobhead, where it is apposed, i.e., joined in Siamese-twin fashion, to Taylor Glacier...

, 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 name Rotunda Glacier was used for this feature in the report "Tephra in Glacier Ice" by J.R. Keys, P.W. Anderton, and P.R. Kyle following the 1973-74 and 1974-75 seasons. Named in association with the 2,410 m butte of the same name on the west side of the glacier.