The Rio São Francisco Falso is a watercourse in the state of Paraná, Brazil, specifically in the region of Santa Helena in western Paraná. It is an afluent of the Itaipu Reservoir. One known trail or route for paddlers begins at the Auto Posto Maraskin in São Francisco Subheadquarters, Santa Helena, though the initial part of this route is described as being on paved terrain, suggesting the put-in may be accessed from this point. The river's water quality has been assessed and, when compared to another afluent of the Itaipu Reservoir, the Rio Ocoí, the waters of the Rio São Francisco Falso are noted to present better quality. This suggests a generally cleaner water body for recreational use. The river is also referred to as the Rio São Francisco Falso (Braço Sul), indicating it may be a southern branch of the system. Specific details on hazards, seasonal conditions, water temperatures, exact access points, or recommended routes are not extensively detailed, but the presence of a defined starting point and the noted water quality are positive indicators for trip planning.