The Rio Água Boa do Univini is a river in the state of Roraima in northern Brazil, flowing for approximately 220 kilometers through the Amazon region. It is classified as a blackwater river, a type of water body common in the Amazon basin characterized by dark, tea-colored water resulting from dissolved organic matter, which typically indicates good water quality and clarity. The river's course runs through remote and largely undeveloped areas, suggesting a wilderness paddling experience with limited facilities or formal access points for boaters. The primary natural feature of interest for visitors is the presence of large peacock bass, locally known as tucunaré (Cichla spp.), which are a major draw for sport fishing. The river's environment, being a blackwater tributary in the Amazon, implies a setting of dense tropical rainforest, which likely offers sightings of associated wildlife. There is no information available regarding specific put-in or take-out locations, recommended routes, seasonal water levels, water temperatures, hazards, regulations, or paddling restrictions. The available data points to a river that is significant for ecological and recreational fishing studies within a pristine and isolated part of the Brazilian Amazon.