What in a river us composed of sediment plus materials from the watershed area?

The components of a river that are composed of sediment and materials from the watershed area are known as the river's load. This load includes various types of sediment such as sand, silt, and clay, as well as organic matter, nutrients, and pollutants that are carried from surrounding land into the river. This material is transported by the river's flow and can influence the river's ecology, chemistry, and physical characteristics. The interaction between the river and its watershed plays a crucial role in shaping the river's health and ecosystem.