meander - a bend in a river. The outside of the meander has the fastest flow and deepest water., delta - a river mouth choked with sediment causing the main channel to split into smaller branching channels or distributaries., tributary - a smaller river that joins a larger one., confluence - the point at which rivers meet., estuary - the tidal mouth of a river, with large, flat expanses of mud exposed at low tide., floodplain  - the wide, flat floor of a river valley. It consists of sediments (alluvium) deposited by the river., levee - river embankments built by deposition as the river floods., mouth - where a river ends, at a lake or the sea., oxbow lake - a meander which has been cut off from the main river channel and abandoned., source - where a river starts, usually in the mountains., waterfall - form where the river meets a band of softer rock after flowing over an area of more resistant material. Waterfalls progressively cut back, leaving a gorge., main channel  - the bed of a stream or river through which the majority of water flows,

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