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Head of tide, tidal limit or tidehead is the furthest point upstream where a river is affected by tidal fluctuations, or where the fluctuations are less than a certain amount. The river section influenced by tides and marine forces, but without salinity is a tidal river. Downstream areas are brackish and termed estuaries.
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tidal head tide river upstream tides limit point may maps navigation many new miles water estuaries tidehead furthest affected fluctuations
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