The Rio Manuel Alves, also known as the Manuel Alves Grande River, is a significant watercourse in the State of Tocantins, Brazil, where it forms part of the larger Tocantins River watershed. It serves as a geographical divider between the north and northeast regions of the country. For paddlers, the river is noted for hosting a recreational activity known as Boia Cross, or buoy cross, in the municipality of Rio da Conceição. This family-friendly adventure involves floating down the river on inflatable buoys, indicating a section of the river suitable for a relaxed, nature-focused water experience. While specific access points, boat ramps, and facilities for traditional kayaking or paddleboarding are not detailed, the existence of organized buoy cross tours suggests there are established points for entering and exiting the river in that area. The overall character of the paddling experience on the Rio Manuel Alves appears to be centered on adventure tourism and direct contact with the natural environment. No information is available regarding specific hazards, seasonal water patterns, water quality, regulations, or recommended routes for independent paddling trips.