The Rio dos Bois is a river in the state of Goiás, central Brazil, where it flows into the São Simão reservoir, a body of water fed by the larger Paranaíba River. The river offers a paddling experience characterized by class I and II rapids, indicating generally gentle, moving water with occasional small waves and straightforward, clear passages. Some sections of the river narrow, which can concentrate the current and require more precise maneuvering. A specific kayak descent logged in October 2019 provides a real-world reference for these conditions. For trip planning, online resources like PaddleWays offer tools to view access points, water conditions, and the boundaries between private and public land along the river, which is crucial for identifying legal put-in and take-out locations. The river's terminus at the São Simão reservoir suggests that paddlers may encounter broader, more lake-like conditions near its mouth, contrasting with the narrower, flowing sections upstream.