Rio Nhundiaquara winds through the lush Atlantic Forest of the Serra do Mar mountain range along the coast of Paraná, Brazil, flowing approximately 37 kilometers before emptying into Paranaguá Bay. This river holds deep historical significance as the first natural route connecting the coastal lowlands to the interior plateaus of Paraná, and was originally known as the Rio Cubatão — once celebrated as the richest gold-bearing river in the region. Today, the Nhundiaquara flows through the charming colonial town of Morretes, where its clear mountain waters and scenic Atlantic Forest surroundings make it a compelling destination for anglers and nature enthusiasts alike.