土，由美国内政部岛屿事务办公室负责管理。地理：关岛是太平洋马里亚纳群岛最南端最大的岛屿，位于东京以南约 2 200公里、夏威夷西南偏西 6 000 公里。该领土是一个单独岛屿，由两块地质不同但面积大致相同的地区组成。岛屿的北部是珊瑚状石灰岩高地，南部为山区。阿普拉港是太平洋最大的深水港之一。
Geography: Guam is the southernmost and largest of the Mariana Islands in the Pacific Ocean, situated about 2,200 km south of Tokyo and 6,000 km west-south-west of Hawaii. It consists of a single island comprising two distinct geologic areas of about equal size. The northern part of the island is a high coralline limestone plateau and the southern region is mountainous. Apra Harbor is one of the largest deep-water ports in the Pacific.