Represa Do Rio Manso, known locally as Lake Manso, is a stunning reservoir nestled in the heart of Mato Grosso State, Brazil, approximately 130 kilometers from Cuiabá. Formed by the damming of the Rio Manso — a tributary of the Rio Cuiabá within the Rio Paraguai basin — this reservoir sits upstream from the legendary Brazilian Pantanal and shares much of its remarkable ichthyofauna with that iconic wetland ecosystem. The lake has earned a reputation as one of Brazil's premier sportfishing destinations, drawing anglers from across the country and around the world with its explosive peacock bass fishing and extraordinary biodiversity. Unlike many Amazonian fisheries, Lake Manso is celebrated for its stable water levels, meaning anglers can count on consistent conditions regardless of the season. The reservoir's climate has proven ideal for both native and introduced peacock bass species, and it holds the distinction of harboring the largest Blue Peacock Bass found anywhere in Brazil.