Rio Jaguarí is a river located in São Paulo state in southeastern Brazil, flowing as a tributary of the Paraíba do Sul. The river winds through a diverse landscape that includes both free-flowing stretches and the Jaguari reservoir, which forms part of the Cantareira Water Production System — one of the most significant water supply systems in the region. The river and its associated reservoir sit within the Paraíba do Sul Basin and offer anglers a variety of fishing environments, from open reservoir waters to river channels. The system spans a considerable distance and provides habitat for a mix of native and introduced fish species, making it a destination of interest for local anglers throughout the year.