Rio Tinto, Paraíba is a municipality in the state of Paraíba in the Northeast Region of Brazil. The municipality contains part of the 4,052 hectare…Rio Tinto, Paraíba is a municipality in the state of Paraíba in the Northeast Region of Brazil. The municipality contains part of the 4,052 hectares Guaribas Biological Reserve, a fully protected conservation unit created in 1990.