Day Island is an island

Island

An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, cays or keys. An island in a river or lake may be called an eyot , or holm...

, 7 nautical miles (13 km) long and 3 nautical miles (6 km) wide, lying immediately south of The Gullet

The Gullet

The Gullet is a narrow channel between the east extremity of Adelaide Island and the west coast of Graham Land, separating Hansen and Day Islands and connecting the heads of Hanusse Bay and Laubeuf Fjord...

 and 2 nautical miles (3.7 km) north of Wyatt Island

Wyatt Island

Wyatt Island is an island, 5 nautical miles long and 2 nautical miles wide, lying 2 nautical miles south of Day Island near the center of Laubeuf Fjord, off the west coast of Graham Land. First surveyed in 1936 by the British Graham Land Expedition under Rymill which used the...

 in the north part of Laubeuf Fjord

Laubeuf Fjord

Laubeuf Fjord is a sound in Antarctica, 25 miles long in a north-south direction and averaging 10 miles wide, lying between the east-central portion of Adelaide Island and the southern part of Arrowsmith Peninsula, Graham Land. It connects Hanusse Bay to the north with Marguerite Bay to the south...

, off the west coast of Graham Land

Graham Land

Graham Land is that portion of the Antarctic Peninsula which lies north of a line joining Cape Jeremy and Cape Agassiz. This description of Graham Land is consistent with the 1964 agreement between the British Antarctic Place-names Committee and the US Advisory Committee on Antarctic Names, in...

. First surveyed in 1936 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, who used the provisional name Middle Island for this feature. The island was resurveyed in 1948 by the Falkland Islands Dependencies Survey (FIDS) and renamed by them for Vice Admiral Sir Archibald Day, Hydrographer to the Navy.