Gillock Glacier 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...

 5 nautical miles (9 km) long, flowing north from Mount Walnum

Mount Walnum

Mount Walnum is a large mountain rising to 2,870 m, standing 4 nautical miles east of Mount Wideroe in the Sor Rondane Mountains. Mapped by Norwegian cartographers in 1946 from air photos taken by the Lars Christensen Expedition 1936-37 and named for Ragnvald Walnum, one-time chairman of the...

 to the west of Smalegga Ridge

Smalegga Ridge

Smalegga Ridge is a ridge, 4 nautical miles long, extending north from Mount Walnum to the west of Gillock Glacier, in the Sor Rondane Mountains. Mapped by Norwegian cartographers in 1957 from air photos taken by U.S. Navy Operation Highjump, 1946–47, and named Smalegga ....

, in the Sor Rondane Mountains

Sor Rondane Mountains

The Sør Rondane Mountains are a group of mountains about 100 miles long with main peaks rising to 3, 400 m, between the Queen Fabiola Mountains and Wohlthat Mountains in Queen Maud Land. They were discovered and photographed from the air by members of the Lars Christensen Expedition on February 6,...

.

Mapped by Norwegian

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

 cartographers in 1957 from air photos taken by U.S. Navy Operation Highjump, 1946–47, and named for Lieutenant Robert A. Gillock, U.S. Navy, navigator on Operation Highjump photographic flights in this area and other coastal areas between 14° and 164° East.