Guam, a territory of the United States, is the largest and southernmost of the Mariana Islands in the north-western Pacific Ocean. It is located approximately 3,300 miles west of Hawaii, 1,500 miles east of the Philippines and 1,550 miles South of Japan. The only good anchorage is Apra Harbour, on the western coast and the capital, Agana, is just to the north. Although located in the Northern Pacific, Guam is truly a tropical island paradise. Approximately 30 (48km) miles long and 4 to 9 miles (14km) wide, the northern end of Guam is a plateau of rolling hills and cliffs rising to 600 feet above sea level. Waterfalls, rivers and bays abound throughout Guam's central and southern areas. The beaches of Tumon Bay offer gleaming white sand and crystal clear, calm waters for swimming, snorkeling.