549 sq km (212 sq miles).
Agaña. Population: 1139 (1990). Tamuning is the commercial centre.
Guam is the largest and most southerly island of the Marianas archipelago. It is a predominantly hilly island and its northern end is a plateau of rolling hills and cliffs rising 152m (500ft) above sea level. The cliffs are tunnelled with caves. The island narrows in the middle, with the southern half widening into a land of mountains and valleys cut by streams and waterfalls. The most sheltered beaches are on the western coast.
English and Chamorro are the official languages. Japanese is also spoken.
Christian; 90 per cent Roman Catholic.
GMT + 10.
120 volts AC, 60Hz.
Overseas telecommunications facilities are available in Agaña. Country code: 671. Outgoing international code: 001.
GSM 1900 network exists. Main provider is Guam Wireless Co LLC.
Main ISPs are Guam.Net (website: www.guam.net) and ITE (website: www.ite.net).
The Agaña and Tamuning branches are open Mon-Fri 0800-1600 and Sat 0930-1200. The Guam Main Facility branch is open Mon-Fri 0930-1700 and Sat 1300-1600.
The English-language daily newspaper is The Pacific Daily News.