Mapumai Swamp is the largest wetland in the Cook Islands.Bruce, J. G. (1983) "Patterns and Classification by Soil Taxonomy of the Soils of the Southern Cook Islands" Geoderma 31(4): pp. 301–323 It is located in the north of Atiu, on the edge of the volcanic area. Its flora is dominated by Cladium, giant bullrush, and Azolla filiculoides.
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