Rio Poti is a significant river flowing through the state of Piauí in northeastern Brazil, serving as one of the major tributaries of the lower Parnaíba river system. The river winds through a region characterized by the semi-arid landscape typical of the Brazilian Northeast, eventually joining the Parnaíba near the city of Teresina. The Poti drainage supports a diverse and ecologically rich fish community that reflects strong biogeographic ties to both the Amazon basin and the broader northeastern Brazilian ichthyofauna — a remarkable characteristic that makes it a compelling destination for anglers interested in tropical freshwater fishing. The river passes through varied terrain, with the Açude Fronteiras reservoir representing one of the notable impoundments along its course, offering additional fishing opportunities in still-water conditions alongside the river's flowing reaches.