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coral atoll, unincorporated territory of the United States. It lies in the southwestern Pacific Ocean, about 1,650 miles (2,650 km) southwest of Honolulu. The atoll rises to 20 feet (6 metres), is 1.5 miles (2.4 km) long by 0.5 mile (0.8 km) wide, and has a land area of less than 0.6 square mile (1.6 square km). Its central basin indicates the former existence of a lagoon.