What are the sand and pebbles deposited by a river called?

The sand and pebbles deposited by a river are called sediment. This material accumulates in various forms, such as sandbars and riverbanks, as the river slows down and loses its carrying capacity. Over time, these sediments can contribute to the formation of deltas and floodplains. The process of sedimentation plays a crucial role in shaping river landscapes and ecosystems.