The Site, located on the southernmost coast of the state of Paraná, is considered the most important area for the Paraná antwren (Stymphalornis acutirostris), of which it hosts about 42% of the global population. It features well preserved mangroves, periodically flooded forests, marshes and over 3,000 hectares of the last remains of caixeta (Tabebuia cassinoides) forests. Although it can be considered a well-preserved habitat compared to other bays in Brazil, threats such as overfishing, pollution, unregulated tourism and occupation of areas of mangrove are present.