The Rio Paquequer flows through the Atlantic Forest region of Rio de Janeiro state in southeastern Brazil, serving as one of the notable tributaries of the middle Rio Paraíba do Sul drainage system. This river winds through a landscape shaped by the rich biodiversity of the Atlantic Forest, one of the world's most biodiverse and threatened ecosystems. The river's watershed is part of the Middle Rio Paraíba do Sul bioregion, a system that supports an exceptional diversity of native freshwater fish species, many of which are found nowhere else on Earth. The river stretches approximately 41 miles in length, passing through varied terrain that includes forested stretches and areas near the town of Sumidouro, offering anglers a genuinely wild and ecologically significant fishing experience in one of Brazil's most biologically rich river systems.