544 sq km (210 sq miles).
296 per sq km.
US External Territory (unincorporated).
Head of state:
President Barack Obama since 2009.
Head of government:
Governor Eddie Calvo since 2011.
110 volts AC, 60Hz. American two-pin (flat) or grounded three-pin plugs are used.
Guam is a vibrant, tropical paradise, complete with powdery beaches, and coral reefs teeming with underwater life. Away from the beach, find historic buildings in the bustling capital, Hagåtña, swinging nightlife in Tumon and a melting pot of Asian, European, Pacific Rim and American cultures.
Those looking to get active can lace up those walking boots and climb Mount Lam Lam, or hop on a jet ski and whizz over the surrounding crystal clear waters. Guam is the largest and most southerly island of the Marianas Islands and has been an important US strategic base since the second world war.
Most visits to Guam are trouble-free but you should be aware of the global risk of indiscriminate international terrorist attacks, which could be against civilian targets, including places frequented by foreigners.
This advice is based on information provided by the Foreign and Commonwealth Office in the UK. It is correct at time of publishing. As the situation can change rapidly, visitors are advised to contact the following organisations for the latest travel advice:
British Foreign and Commonwealth Office
Tel: 020 7008 1500.
US Department of State