The Rio Araguari is the primary river of Amapá state in northeastern Brazil. It is less than 400 kilometers long and flows into the Atlantic Ocean, forming part of the Amapá Coast basin. The river has gained significant fame among surfers and kayakers for the Pororoca, a powerful tidal bore wave that occurs at its mouth. This phenomenon, caused by the Atlantic tide rushing into the river's funnel-shaped estuary, creates a unique and challenging paddling experience, though it requires extensive logistical planning, including a 16-hour boat ride from Macapá to the river's northern basin near the ocean. The overall character of the river is heavily influenced by its coastal and estuarine environment. The region's remote nature suggests limited facilities, and paddlers should be prepared for a significant expedition. The river's course has been subject to notable environmental changes, including blockages and erosion along its banks, which may affect navigation and the surrounding landscape.