Oneroa is the largest village on Mangaia Island, which is part of the Cook Islands archipelago. It is located towards the west of the island, in the district of Kei'a, and contains over half of the island's population. Oneroa is a contiguous village area that consists of three villages, Tavaʻenga, Kaumata and Temakatea.Bryant James Allen: The Development of Commercial Agriculture on Mangaia: Social and Economic Change in a Polynesian Community. Masters Thesis, Massey University, 1969, page 53 and 54
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