Unger Island is a small, ice-free island of Antarctica. Lying 4 miles to the southeast of the Cape Hooker

Cape Hooker (Antarctica)

Cape Hooker is a cape on the northeast portion of the cove which includes Davis Ice Piedmont, on the north coast of Victoria Land. With Cape Dayman to the east-southeast, it forms an outer entrance point to Yule Bay...

, it is the westernmost of the Lyall Islands

Lyall Islands

Lyall Islands is a group of four islands, Unger, Surgeon, Novosad and Hughes, lying just outside the entrance to Yule Bay, Victoria Land. Discovered by Capt. James Clark Ross, 1841, who named the group for David Lyall , MD, RN, FLS, Asst. Surgeon on the Terror...

 — at Latitude 70° 41' 00.0" S , Longitude 166° 55' 00.0" E.

It was originally mapped in the 1960s from surveys and U.S. Navy photographs by the United States Geological Survey

United States Geological Survey

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology,...

 (USGS). It was named for Lt. Pat B. Unger, USNR

United States Navy Reserve

The United States Navy Reserve, until 2005 known as the United States Naval Reserve, is the Reserve Component of the United States Navy...

, the Medical Officer at Little America V in 1957. It is the only ice free island in Antarctica.