The Rio Maués-Açu is a river in the northwest of the Brazilian state of Amazonas, flowing through the municipality of Maués. It is a tributary of the Amazon River system, situated east of the Madeira River and south of the main Amazon River channel. The upper course of this river is known as the Parauari River. The river's geographical position places it within the heart of the Amazon basin, contributing to its overall character as a remote and significant waterway within the vast regional river network. For paddlers, this location implies an experience deeply connected to the Amazonian environment, with the river serving as a primary artery through the landscape. The town of Maués, sharing the river's name, is the most prominent settlement along its course and likely serves as the primary access point for embarking on or concluding a paddling journey. The river's role as a tributary to the Amazon suggests that paddlers may encounter varying water levels and currents influenced by the seasonal cycles of the larger basin. The absence of information on specific hazards, regulations, or facilities underscores the need for paddlers to undertake thorough, independent planning and reconnaissance for a trip on this remote Amazonian river.