The base level of a
river or
stream is the lowest point to which it can flow, often referred to as the 'mouth' of the river. For large rivers,
sea level is usually the base level, but a large river or
lake is likewise the base level for tributary streams. A rather rare exception can be seen in the
Jordan River, for which the base level is the
Dead Sea, 417 m below modern sea level.
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The lowest level to which a stream can erode the channel through which it flows, generally equal to the prevailing global sea level.
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