A riverbed is the land area that forms the bottom of a river. It is typically made up of soil, sand, gravel, and rocks, which can vary in size and composition depending on the river's location and flow. The riverbed plays a crucial role in directing the flow of water and supporting aquatic ecosystems. Riverbeds can change over time due to natural processes like erosion and sediment deposition. When a river's flow is strong, it can carve deeper channels, while slower flows may lead to the buildup of materials. Understanding riverbeds is important for managing water resources and protecting habitats for wildlife, such as fish and amphibians.