Rivers shape the landscape over time through processes such as erosion, transportation, and deposition. As rivers flow, they erode the land by carrying away sediment and rocks. This erosion can create features like river valleys, canyons, and gorges. The sediment that is carried by the river is then transported downstream and can be deposited in new areas, forming features such as river deltas. Over time, the continuous movement of water and sediment by rivers can significantly alter the landscape, carving out new landforms and reshaping the terrain.