Formosa is an island in the Bissagos Islands, Guinea-Bissau, part of the sector of Caravela. Its area is 140 km2,Formosa in the Catalogue of Islands at UNEP (United Nations Environment Program) - accessed 16 November 2018 its length is 19.9 km and it is 10 km across at its widest. It forms practically one island with Ponta and Maio, separated by creeks. The island has a population of 1,873 (2009 census); the largest village is Abú.População por região, sector e localidades por sexo censo 2009 , Instituto Nacional de Estatística Guiné-Bissau
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