confluence - The point where two rivers, usually of a similar size, meet and join together., upper course - The beginning of a river nearest the source, which is often steep and narrow., bank - The land at the side of a river., gorge - A deep, narrow valley with steep sides, usually formed by a river cutting through hard rock., delta - A wetland area formed when a river empties its water and sediment into the sea., waterfall - A steep fall or flow of water from a height., tributary - A smaller river or stream that flows into a larger stream or river., erosion - Where rocks and earth wear away, changing the shape of the land., lower course - The end of a river which flows more slowly., rapids - A fast-flowing and turbulent part of the river., oxbow lake - A curved lake formed after a bend in a river is cut off., meander - A curve or bend in a stream or river., middle course - The middle of a river which is usually wide and deep., estuary - Where a river (fresh water) reaches a sea (salt water)., floodplain - The flat area around a river that often get flooded when a level of water in the river is high., dam - A barrier across a river that blocks flowing water., source - The origin of the stream or river., mouth - Where a river flows into a larger body of water., current - The strength and speed of a river., river basin - An area of land drained by a river.,

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