largest island in the southern group of the Cook Islands, in the South Pacific Ocean, about 2,100 miles (3,400 km) northeast of New Zealand. Volcanic in origin, it has a rugged interior rising to 2,139 feet (652 metres) at Te Manga. Surrounding its mountainous core is a plain, an ancient raised fringing coral reef covered with sediment. The island itself is fringed by a coral reef.
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