Canyonlands National Park is a wilderness of countless canyons and fantastically formed buttes carved by the Colorado River and its tributaries. Rivers divide the park into four districts: Island in the Sky, The Needles, The Maze, and the rivers themselves. The park preserves the natural beauty and human history throughout its four districts. While they share a primitive desert atmosphere, each offers different opportunities for wildness and solitude. The Colorado and Green Rivers have played a significant role in shaping the landscape of Canyonlands. Seeing the park from the bottom up affords a unique perspective. Above their confluence at the heart of Canyonlands, the rivers offer miles of flatwater perfect for canoes, sea kayaks and other shallow-water boats. A commercial upriver shuttle is necessary for non-motorized boats. Below the confluence, the combined flow of both rivers spills down Cataract Canyon with remarkable speed and power, creating a fourteen-mile stretch of Class III to V whitewater. It is a particularly hazardous and isolated section of the Colorado River, subject to extreme water level fluctuations, for experienced river runners only.