The Rio Araguari flows through the Triângulo Mineiro region of Minas Gerais, Brazil, as one of the largest left-bank tributaries of the Rio Paranaíba, which itself is part of the upper Paraná River basin. The river drains a biogeographically distinctive region, harboring a fish fauna that includes both widespread Neotropical species and endemic forms found nowhere else. The presence of multiple hydropower dams along its course — most notably the Amador Aguiar II (AAD), which began operation in 2007 and features a run-of-river reservoir covering approximately 45.1 km² — has shaped the river's hydrology and fish communities significantly. Inflow to the Amador Aguiar II reservoir is regulated by upstream facilities, particularly the Nova Ponte Hydropower Dam, making the Araguari a tailwater system through much of its middle and lower reaches.