The Ribeirão São Manoel is part of the Tapajós River Basin in the Amazon region of Mato Grosso, Brazil. The water body's character has been significantly altered by the presence of the São Manoel hydroelectric dam, a major infrastructure project located in the Região Geográfica Intermediária. This dam forms the Usina Hidrelétrica São Manoel, which has created a reservoir and irrevocably changed the local environment and the livelihoods of surrounding communities. The dam is situated in an area of high biological significance, as the Tapajós Basin is recognized as one of eight areas of Amazonian biological endemism, hosting numerous species found nowhere else on Earth.

For paddlers, planning a trip requires careful consideration of this developed setting. The PaddleWays platform lists specific access points, boat ramps, and facilities for getting onto the Rio São Manoel, indicating that managed put-in and take-out locations exist. Paddlers should anticipate a water body influenced by hydroelectric operations. The surrounding area is noted for its rich biodiversity, offering the potential to see unique Amazonian wildlife. Given the dam's presence and the sensitive ecological context, paddlers must proactively check for any active restrictions or regulations governing water access and recreational use. The best seasons for paddling and specific route recommendations are not detailed, so consulting local resources for current access and seasonal flow patterns is essential before departure.