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Guam
Guam is the largest (550 km2) and southernmost island in the Mariana Islands archipelago, located at 13.28 N, 144.47 E, about three-quarters of the way from Hawaii to the Philippines. The island is approximately 30 miles long, with a variable width ranging from 4 to 12 miles, and has a total land mass of 212 square miles. There is 125.5 km of coastline; volcanic origin, surrounded by coral reefs; relatively flat coralline limestone plateau (source of most fresh water) with steep coastal cliffs and narrow coastal plains in north, low-rising hills in center, mountains in south. Highest point is Mt. Lamlam at 1.334 ft (407 meters); lowest point is the Marianas Trench on eastern exposure.

Northern Islands Sanctuary
The islands of Asuncion, Guguan, Maug, Managaha, Sarigan and Uracas (Farallon De Pajaros) are maintained as uninhabited places. No permanent structures can be built and no persons can live on the islands except as necessary for the purposes for which the islands are preserved. The islands are preserved as habitats for birds, fish, wildlife, and plants. The permanent status given the preserve on Maug is based on a survey of the botany, ornithology, terrestrial biology, marine biology, and ichthyology of the three islands that are collectively known as Maug.

Rota
Rota is 69 miles south of Saipan and 47 miles north of Guam. It is approximately 10.5 miles long and 3 miles wide with a 38.3 mile coastline encompassing an area of 32.8 square miles (14  8N 145  12E). The highest elevation is Mt. Manira at 1,625 feet. The principal community is Songsong. The Spanish Galleon Santa Margarita sailing from the Philippines bound for Acapulco, Mexico in the late 17th century wrecked on the reef off Teteto Beach, Rota. Its wreckage was discovered in 1995.

Tinian
Tinian is located 6 miles south of Saipan and is 10.5 miles long by 5 miles at its widest point and has a total area of 39.2 square miles and a coastline 38 miles in length (14  58N 145  37E). The highest point, Puntan Carolinas, is 583 feet above sea level. The principal community is San Jose. A large portion of Tinian is leased to the U.S. military.