Deposition is the opposite of erosion. Deposition is where a river lays down or drops the sediment or material that it is carrying. Rivers carry lots of different sediment, including rocks, boulders, silt, mud, pebbles and stones. Normally, a river has the power to carry sediment. If the force of a river drops, the river cannot carry sediment. This is when the river deposits its sediment.

This often happens on the inside bend of a meander in a river. This is due to this side being the slower velocity of the river channel.