Rio Atibaia is a river flowing through the interior of São Paulo state, Brazil, winding through a landscape shaped by the Atlantic Forest biome and the agricultural and urban development characteristic of this densely populated region. The river passes through or near several municipalities in the Campinas metropolitan area, including Atibaia, Itatiba, Valinhos, and Campinas, making it an accessible fishery for a large population of anglers. The river is part of the broader Piracicaba-Capivari-Jundaí river basin, a hydrologically significant watershed in southeastern Brazil. The surrounding riparian zone reflects the pressures of the region, with stretches of native gallery forest interspersed with agricultural land and urban margins. The river offers a variety of water types along its course, providing habitat for a diverse assemblage of native and introduced fish species that attract local anglers year-round.