Rivers are dynamic natural features that flow from higher elevations to lower areas, often emptying into oceans or lakes. They have various parts, including the source, where the river begins, and the mouth, where it meets another body of water. Along their journey, rivers can create important features like meanders, which are curves in the river's path, and oxbow lakes, which form when a meander is cut off from the main flow. Rivers also shape the landscape through erosion and sediment deposition. As they flow, they can carve out valleys and create floodplains, which are flat areas that can be flooded during heavy rains. These features are vital for ecosystems and human activities, providing water, transportation, and fertile land for agriculture.