Lystad Bay is a bay

Bay

A bay is an area of water mostly surrounded by land. Bays generally have calmer waters than the surrounding sea, due to the surrounding land blocking some waves and often reducing winds. Bays also exist as an inlet in a lake or pond. A large bay may be called a gulf, a sea, a sound, or a bight...

 2.5 nautical miles (4.6 km) wide which indents the west side of Horseshoe Island

Horseshoe Island (Antarctica)

Horseshoe Island is an island 6.5 nautical miles long and 3 nautical miles wide occupying most of the entrance to Square Bay, along the west coast of Graham Land. Discovered and named by the British Graham Land Expedition under Rymill who mapped this area by land and from the air in 1936-37...

, in the northeast part of Marguerite Bay

Marguerite Bay

Marguerite Bay or Margaret Bay is an extensive bay on the west side of the Antarctic Peninsula, which is bounded on the north by Adelaide Island and on the south by Wordie Ice Shelf, George VI Sound and Alexander Island. The mainland coast on the Antarctic Peninsula is Fallières Coast. Islands...

. First surveyed in 1936-37 by the British Graham Land Expedition

British Graham Land Expedition

A British expedition to Graham Land led by John Lachlan Cope took place between 1920 and 1922. The British Graham Land Expedition was a geophysical and exploration expedition to Graham Land in Antarctica between 1934 to 1937. Under the leadership of John Riddoch Rymill, the expedition spent two...

 (BGLE) under Rymill. The bay was visited by the United States Maritime Service

United States Maritime Service

The United States Maritime Service, abbreviated as USMS, was established in 1938 under the provisions of the Merchant Marine Act of 1936. The mission of the organization is to train people to become officers and crewmembers on merchant ships that form the United States Merchant Marine...

 (USMS) North Star and USS Bear of the United States Antarctic Service (USAS) in 1940. The name was proposed by the Advisory Committee on Antarctic Names

Advisory Committee on Antarctic Names

The Advisory Committee on Antarctic Names is an advisory committee of the United States Board on Geographic Names responsible for recommending names for features in Antarctica...

 (US-ACAN) for Captain Isak Lystad of the North Star.