Minami-Tori-shima (南鳥島, "Southern Bird Island"), also known as Marcus Island, is an isolated Japanese coral atoll in the northwestern Pacific Ocean, located some 1,848 kilometres (1,148 mi) southeast of Tokyo and 1,267 kilometres (787 mi) east of the closest Japanese island, South Iwo Jima of the Ogasawara Islands, and nearly on a straight line between mainland Tokyo and the United States' Wake Island, 1,415 kilometres (879 mi) further to the east-southeast. The closest island to Minami-Tori-shima is East Island in the Mariana Islands, which is 1,015 kilometres (631 mi) to the west-southwest. The meaning of its Japanese name is "Southern Bird Island". It is the easternmost territory belonging to Japan, and the only Japanese territory on the Pacific Plate, past the Japan Trench. Although very small (just over 1 km²) and without a civilian population, it is of strategic importance, as it enables Japan to claim a 428,875 square kilometres (165,589.6 sq mi) Exclusive Economic Zone in the surrounding waters.