Mangaia is the most southerly of the Cook Islands and the second largest, after Rarotonga. It is a roughly circular island, with an area of 51.8 square kilometres, 203 kilometres from Rarotonga. Originally heavily populated, Mangaia's population has dropped by 75% in the last 50 years.
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Coordinates -21°55'42.042" N -157°55'10.103" E