The Rio Ji-Paraná, also known as the Rio Machado, is a significant river flowing through the state of Rondônia in western Brazil. It is a major tributary of the Madeira River within the vast Amazon Basin. The river flows directly through the city of Ji-Paraná, which is the second-largest city in Rondônia, providing a primary urban access point for paddlers. The riverfront area, known as the Orla da Cidade, is a focal point for activities and is just minutes from the city center. The water is described as turbid, which is a natural characteristic, and sources indicate it is not polluted. The river offers scenic landscapes along its banks, with opportunities to view wildlife. It is actively used for recreational boating, fishing, and boat tours, suggesting a paddling environment that can range from urban to more natural settings as one moves away from the city. The river's size and flow can vary significantly; it has been known to exceed 10 meters in height during periods of high water, which can lead to flooding and would be a major safety consideration for paddlers planning a trip. The Defesa Civil monitors these conditions. While specific paddling routes, exact water temperatures, and detailed regulations are not provided, the river's character as a major Amazon tributary flowing through a regional urban center provides a distinct setting for exploration.