Guam is the most populous and southernmost island of the Mariana Islands and a U.S. Territory, located in the western Pacific Ocean. The island's coastline stretches 125 km with a land area of 541 square km. This small territory is situated 2,198 km northeast of Indonesia, 2,491 km east of the Philippines, 2,605 km south of Japan and 9,615 km west of California.
The vast majority of the population in Guam resides in the districts and villages of the central and northern areas. Dededo, Tamuning and Yigo are the three largest villages. Other significantly populated communities in the central-north regions of Guam include Barrigada, Chalan Pago, Mangilao, and Mongmong-Toto-Maite. The entire southern half of Guam is considered rural area and is sparsely populated. The villages and districts of West, Southwest and the Southeast coast of Guam are all connected by one main perimeter road, known as Route 17. It extends from Apra Harbor, in the west, Agat, Umatac, and Merizo, in the southwest, and Inarajan, Talofofo, and Yona on the Southeast coast.