The Rio do Coco is a river in the state of Tocantins in central Brazil, where it serves as a tributary to the larger Araguaia River. It flows through the biodiverse Cantão State Park, a region known for its rich aquatic ecosystems. The river's character is defined by its role within this protected wetland area, offering a paddling experience focused on wildlife observation in a remote, natural setting. A notable multi-day expedition involves a boat trip on the Rio do Coco specifically for spotting iconic fauna such as giant otters, river dolphins, and a variety of bird species. The presence of these animals suggests a healthy, clean aquatic environment. The river's course includes access to sandy beaches, which can serve as potential rest stops or lunch spots during a journey. The best time of day for wildlife viewing and paddling appears to be in the morning. Paddlers should be aware that as the river is within Cantão State Park, all activities are likely subject to the park's regulations and restrictions, which should be researched prior to any visit.