Flanagan Island (sometimes referred to in older charts as Witch 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...

 located within the Virgin Islands archipelago in the Caribbean

Caribbean

The Caribbean is a crescent-shaped group of islands more than 2,000 miles long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north...

 and forms part of the U.S. Virgin Islands

United States Virgin Islands

The Virgin Islands of the United States are a group of islands in the Caribbean that are an insular area of the United States. The islands are geographically part of the Virgin Islands archipelago and are located in the Leeward Islands of the Lesser Antilles.The U.S...

.

It is located just off of the eastern end of St. John island

Saint John, U.S. Virgin Islands

Saint John is an island in the Caribbean Sea and a constituent district of the United States Virgin Islands , an unincorporated territory of the United States. St...

. For many years the island fell between the claimed maritime boundaries

Maritime boundary

Maritime boundary is a conceptual means of division of the water surface of the planet into maritime areas that are defined through surrounding physical geography or by human geography. As such it usually includes areas of exclusive national rights over the mineral and biological resources,...

 of the British Virgin Islands

British Virgin Islands

The Virgin Islands, often called the British Virgin Islands , is a British overseas territory and overseas territory of the European Union, located in the Caribbean to the east of Puerto Rico. The islands make up part of the Virgin Islands archipelago, the remaining islands constituting the U.S...

 and U.S. Virgin Islands. However, the United Kingdom Foreign and Commonwealth Office

Foreign and Commonwealth Office

The Foreign and Commonwealth Office, commonly called the Foreign Office or the FCO is a British government department responsible for promoting the interests of the United Kingdom overseas, created in 1968 by merging the Foreign Office and the Commonwealth Office.The head of the FCO is the...

 formally relinquished its claim to Flanagan Island in 1977 in an agreement with a US delegation headed by David Colson, Deputy Assistant Secretary for Oceans, US Dept. of State.

Flanagan Island is uninhabited and is regarded as a nature reserve. However, it is not part of Virgin Islands National Park

Virgin Islands National Park

Virgin Islands National Park is a United States National Park covering approximately 60% of the island of Saint John in the United States Virgin Islands, plus a few isolated sites on the neighboring island of St. Thomas...

which accounts for approximately 75% of St. John and adjacent islands.