evidence: Marshall Islands, country in the central Pacific Ocean. It consists of some of the easternmost islands of Micronesia. The Marshalls are composed of more than 1,200 islands and islets in two parallel chains of coral atolls—the Ratak, or Sunrise, to the east and the Ralik, or Sunset, to the west. The chains lie about 125 miles (200 km) apart and extend some 800 miles northwest to southeast. [...] None of the 29 low-lying coral atolls and the five coral islands in the Marshall group rises to more than 20 feet (six metres) above high tide. The islands are coral caps set on the rims of submerged volcanoes rising from the ocean floor. The island units of the Marshalls are scattered over about 180,000 square miles of the Pacific. The largest atoll in the group and in the world is Kwajalein, which has a land area of only six square miles but surrounds a 655-square-mile lagoon. The Marshall Islands’ nearest neighbours are Wake Island (north), Kiribati and Nauru (south), and the Federated States of Micronesia (west). [...] The republic’s main sources of revenue are substantial U.S. subsidies under a Compact of Free Association and the leasing of land for the U.S. missile testing range on Kwajalein. Employment and modern amenities at both Majuro and Kwajalein serve as magnets that draw people to the two urban centres.