迪亞哥加西亞島（Diego Garcia）是查戈斯群島的主島，也是英屬印度洋領地首府所在地，距離印度最南端1900公里。位處太平洋與印度洋的重要國際水域，戰略地位重要。1532年葡萄牙人迪亞哥加西亞到達，1810年被英國佔領，為英屬模里西斯屬地，1965年成為英屬印度洋領地的一部分。1966年英美簽訂協議後，成為美國在印度洋的重要海空軍基地。

島上有英美的聯合軍事基地，但主要是美軍使用。由於軍事原因，該島無常駐居民，原住民被英政府驅逐。

Diego Garcia is a tropical footprint-shaped coral atoll located south of the equator in the central Indian Ocean. It is part of the British Indian Ocean Territory (BIOT).

The United States Navy operates Naval Support Facility (NSF) Diego Garcia, a large naval ship and submarine support base, military air base, communications and space-tracking facility, and an anchorage for pre-positioned military supplies for regional operations aboard Military Sealift Command ships in the lagoon.

The Naval Support Facility (NSF) Diego Garcia is a US

Navy installation located in the British Indian Ocean Territory (BIOT).

 

 

 

NSF Diego Garcia provides logistic, service and installation support for the US and Allied forces forward deployed in the Indian Ocean and Arabian Gulf regions. Diego Garcia is home to 16 separate commands. The base accommodates 360 military personnel, 1,800 base operation services contractor (BOSC) staff, 300 mariners (MSC), 220 civilians and 80 overseas government employees.