source- the area in which a river begins.
mouth-where a river ends it journey,flowing into the sea or a lake.
tributary- a smaller river that joins a larger river.
confluence- the point at which two rivers join.
watershed- the boundary between two drainage basins marked by a ridge of high land.
drainage basin- the area which is drainged by a river and its tributary.
drainage density- the total lenght of all the streams in the basin divided by the total area of the basin.
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