The Rio da Onça State Park is in the center of the municipality of Matinhos, Paraná, and covers 1,660 hectares (4,100 acres).

[1] The park has a portal, interpretive trails, suspended bridges, visitor center and belvedere.

[1] Trails start from the visitor center and are well marked and on flat ground, with explanatory signs.

[1] Flora include Nectandra megapotamica, Ilex theezans, Tapirira guianensis, jacaranda, Crataeva tapia and Clusia criuva.

[3] Fauna include Brazilian guinea pig (Cavia aperea), oncilla (Leopardus tigrinus) and opossums (Didelphis).