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Tongatapu Group, southernmost island cluster of Tonga, in the South Pacific Ocean, about 1,400 miles (2,300 km) north-northeast of Auckland, N.Z. Its administrative headquarters is at Nukuʿalofa, the national capital, on the northern coast of Tongatapu Island. Tongatapu Island, the largest island (100.6 square miles [260.5 square km]) of Tonga, dominates the group. Its name means “sacred south”: the word taboo is derived from the Tongan term tabu, meaning “sacred.” The coral island is level...