A river course refers to the path that a river follows as it flows from its source to its mouth. This journey typically includes three main stages: the upper course, where the river is steep and fast-flowing; the middle course, where it becomes wider and slower; and the lower course, where it meanders and deposits sediment before reaching a larger body of water, such as an ocean or lake. The characteristics of a river course can be influenced by various factors, including the landscape, climate, and geology of the area. Features such as waterfalls, rapids, and meanders can develop along the river's path, shaping the surrounding environment and ecosystems.