The mainly ice-covered Prehn Peninsula (75°06′S 63°30′W) is 32 km (20 mi) long and 16 km (10 mi) wide, between Hansen and Gardner Inlets, on the eastern coast and at the base of Antarctic Peninsula

Antarctic Peninsula

The Antarctic Peninsula is the northernmost part of the mainland of Antarctica. It extends from a line between Cape Adams and a point on the mainland south of Eklund Islands....

. First observed from aircraft by the RARE, 1947-48. Mapped by USGS from surveys and US Navy air photos, 1961-67. Named by US-ACAN for Lt. Cdr. Frederick A. Prehn, Jr., USN, pilot on photographic flights in the Pensacola Mountains

Pensacola Mountains

The Pensacola Mountains are a large group of mountain ranges and peaks in Antarctica, extending 450 km in a NE-SW direction, comprising the Argentina Range, Forrestal Range, Dufek Massif, Cordiner Peaks, Neptune Range, Patuxent Range, Rambo Nunataks and Pecora Escarpment...

 and Alexander Island

Alexander Island

Alexander Island or Alexander I Island or Alexander I Land or Alexander Land is the largest island of Antarctica, with an area of lying in the Bellingshausen Sea west of the base of the Antarctic Peninsula, from which it is separated by Marguerite Bay and George VI Sound. Alexander Island lies off...

 areas on Operation Deep Freeze

Operation Deep Freeze

Operation Deep Freeze is the codename for a series of United States missions to Antarctica, beginning with "Operation Deep Freeze I" in 1955–56, followed by "Operation Deep Freeze II", "Operation Deep Freeze III", and so on...

1967 and 1968.