The Rio Jaú is a blackwater river flowing through the heart of the expansive Jaú National Park in Amazonas, Brazil. It is a remote and seldom-visited waterway, characterized by its dark, tea-colored waters that flow through extensive flooded igapó forests. Access to the river is primarily via the Rio Negro, with the journey to the park entrance requiring a long navigation of 14 to 18 hours by traditional Amazonian boat from Novo Airão, which serves as the main gateway. Paddling here is an expedition-style experience focused on deep immersion in pristine rainforest. The overall character is one of profound isolation and connection with a wild ecosystem, with travel conducted via silent canoes or small boats to minimize disturbance. The river and its surrounding park are home to a rich array of wildlife, including Boto dolphins, caimans, and diverse bird and plant species. Notable sights while on the water include the submerged forest landscapes, and the park itself features terrestrial attractions like secluded waterfalls and ancient caves accessible via hikes from the river. The area has no developed facilities for independent paddlers; visits are typically organized through guided tour operators who provide expedition boats as floating bases. These tours often combine paddling through the flooded forests with hiking on terra firme trails. The best time for paddling is during the high water season, when the forest is flooded and canoes can glide silently among the trees.