Guam is the largest and southernmost of the Mariana Islands. It is an unincorporated territory of the United States located in the Pacific Ocean. The island was ceded to the United States by Spain in 1898. The United States Army and Navy maintains military bases on Guam.
The population of Guam is estimated at 173,456 in 2007.  Chamorro and English are the primary languages spoken in Guam. The highest point in Guam is Mount Lamlam, which is 1,332 feet (406 m). The weather is usually hot and humid, ranging from 86° to 74°, with an average annual rainfall of 96 inches, and often has typhoons, especially during the months of October and November.