The name of the Territory. Guam is a U.S. island territory in Micronesia, in the Western Pacific. It's distinguished by tropical beaches, Chamorro villages and ancient latte-stone pillars. Guam’s WWII significance is on view at the War in the Pacific National Historical Park, whose sites include Asan Beach, a former battlefield. The island’s Spanish colonial heritage is evident in Fort Nuestra Señora de la Soledad, atop a bluff in Umatac.