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The last part of a river. A river usually ends by flowing into an ocean, a lake or a bigger river. The place where the river flows out into a bigger body of water is called the 'mouth' of the river. As a river flows towards its mouth, the countryside around the river often changes from hilly to flat.
A river that meets the sea or a large lake may form a delta at its mouth: a triangle-shaped area of sediment with distributaries flowing across it. The area of water around a river mouth where seawater mixes with freshwater is called an estuary. The land around a stream is a valley.Valleys come in all sizes and have a variety of names, just like streams. The smallest streams, rills, run in tiny channels also called rills.he bottom end is its mouth. In between, the stream flows through its main course or trunk. Streams gain their water through runoff, the combined input of water from the surface and subsurface. Most streams are tributaries, meaning that they drain into other streams.