The Rio Tartarugal Grande is a river in the state of Amapá, Brazil. For paddlers, the Paddleways website serves as a resource for identifying water access points, boat ramps, and other facilities along the river, which are critical for trip planning. Potential paddlers should be aware of a significant water quality concern. Research indicates that sediment samples have been collected from an older tailing pond of a currently operating mine that drains directly into the Tartarugal Grande River. This suggests the presence of active or historical mining activity in the watershed, which can introduce contaminants and affect water quality. Paddlers should exercise caution and seek current, local information regarding water conditions and safety before embarking on a trip.