Reservatório Corumbá IV is a large hydroelectric reservoir in the Centro-Oeste region of Brazil, covering approximately 173 km² in the state of Goiás. It was formed by the damming of the Rio Corumbá and inaugurated in 2006 as part of the Usina Hidrelétrica Corumbá IV, which has an installed generating capacity of 129.6 MW. The reservoir's waters touch seven municipalities: Abadiânia, Alexânia, Luziânia, Silvânia, Novo Gama, Corumbá de Goiás, and Santo Antônio do Descoberto. Its geographic coordinates are approximately 16°19′22″ S and 48°11′15″ W, placing it in close proximity to the Distrito Federal and Brasília.

The reservoir's principal feeder is the Rio Corumbá, which enters the lake in the portion bordering Corumbá de Goiás. Additional tributary sub-basins include the Areias, Descoberto, Alagado, Antas, Cervo, and Pirapitinga-Sarandi drainages, giving the water body a complex, branching shoreline typical of large impoundments in the Brazilian Cerrado.

The climate follows a Köppen Aw classification — a hot tropical regime with relatively stable temperatures year-round (monthly average around 20°C) and a pronounced dry season in winter. This dry-season pattern affects paddlers directly, as water levels and conditions on the reservoir vary between the wet and dry periods.

The reservoir serves multiple purposes, including recreation, tourism, and fishing alongside power generation and water supply. Nautical sports are practiced on the lake, though the surrounding municipal shorelines remain relatively undeveloped for tourism. Paddlers should be aware that environmental patrol teams from Corumbá Concessões operate on the water, conducting educational outreach and monitoring use of the reservoir. These teams approach vessels by boat, particularly at high-traffic areas, and provide guidance on responsible use of the resource.

Fishing regulations apply, including closed-season (piracema) restrictions that vary by species and river basin, and paddlers who fish should consult current rules from Brazil's official fisheries authority before their trip.