River features are the physical characteristics of a river, such as its bends, deltas, BEDS, and falls. Bends refer to the curves in a river's course, which are caused by erosion or sediment deposition. Deltas are formed when a river splits into several smaller rivers and deposits sediment at its mouth. BEDS are the bottom of a river, which can be composed of rocks, sand, or mud. Finally, falls are waterfalls that occur when a river drops in elevation over a short distance.