A river system consists of a main river and all its tributaries, which are smaller streams and rivers that flow into it. This network of waterways collects rainwater and runoff, transporting it across the landscape. River systems play a crucial role in shaping the environment, providing habitats for wildlife, and supporting ecosystems. The flow of water in a river system is influenced by factors such as topography, climate, and soil type. These systems are essential for human activities, including agriculture, transportation, and water supply. Understanding river systems helps in managing water resources and protecting natural habitats.