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River Thames

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Pharlap | 14:57 Fri 01st Sep 2006 | Science
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Where does the salt water join the fresh water. With the drought, how far does the fresh water travel from its source now and how far should it travel normally.
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The fresh/salt interface is gradual, large, and it moves in and out of the estuary/river with the tide.

I've read that on high tides, the river in the city tastes slightly salty.

I would doubt that even at low tide the fresh water gets more than a mile or two out into what could be called the sea.

Whereas for the Amazon, it gets tens of miles out to sea. I've read you can get fresh(-ish) water even out of sight of land.
Fresh water and salt water meet at Teddington Lock.

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