Rio das Ostras (Portuguese pronunciation: [ˈʁi.u dɐz ˈostɾɐs], locally [ˈχi.ʊ̆ dəjˈz‿o(j)ɕtɾəɕ]) is a municipality located in the Brazilian state of Rio de Janeiro. The municipality has been suffering from environmental impacts due to the pollution of beaches, rivers and lagoons due to lack of basic sanitation and environmental degradation due to illegal occupations in areas of environmental protection (APAs) for the protection and conservation of biotic attributes (fauna and flora). The inland discharge of clandestine sewage from homes and businesses has been causing eutrophication in the ecosystem in an aggressive way.