The **British Indian Ocean Territory (BIOT)** is a remote overseas territory of the United Kingdom, comprising the Chagos Archipelago in the central Indian Ocean. Established as a separate territory in 1965, BIOT was formed by detaching islands from Mauritius and the Seychelles, both then British colonies. Its strategic importance emerged during the Cold War when, between 1968 and 1973, the indigenous Chagossian people were forcibly removed to enable the construction of a joint UK-US military base on Diego Garcia, the largest island in the archipelago. Today, the territory has no permanent civilian population and is primarily used as a military facility. The sovereignty of the BIOT is disputed, with Mauritius asserting a long-standing claim and the United Nations urging the UK to end its administration of the islands. Despite legal and diplomatic challenges, the territory remains under British control, symbolizing a contentious chapter in decolonization and international law.