Duncan Mountains is a group of rugged coastal foothills, about 18 nautical miles (33 km) long, extending from the mouth of Liv Glacier

Liv Glacier

Liv Glacier is a steep valley glacier, long, emerging from the Antarctic Plateau just southeast of Barnum Peak and draining north through the Queen Maud Mountains to enter Ross Ice Shelf between Mayer Crags and Duncan Mountains. Discovered in 1911 by Roald Amundsen, who named it for the daughter...

 to the mouth of Strom Glacier

Strom Glacier

Strom Glacier is a steep valley glacier flowing northeast from the north side of Mount Fridtjof Nansen to the head of the Ross Ice Shelf, flanked on the northwest by the Duncan Mountains and on the southeast by the Herbert Range. The glacier derives its name from "Strom Camp" near its foot,...

 at the head of Ross Ice Shelf

Ross Ice Shelf

The Ross Ice Shelf is the largest ice shelf of Antarctica . It is several hundred metres thick. The nearly vertical ice front to the open sea is more than 600 km long, and between 15 and 50 metres high above the water surface...

. Discovered by the Byrd Antarctic Expedition in November 1929 and named for James Duncan

James Duncan

James, Jim or Jimmy Duncan may refer to:*James Duncan , American politician from Pennsylvania*James H. Duncan , American politician from Massachusetts...

, Manager of Tapley, Ltd., shipping agents for the Byrd expeditions at Dunedin, New Zealand.