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Unfortunately salt water and fresh water do, in fact, mix. You can easily perform an experiment yourself:

1) Take two glasses and fill them with tap water, or filtered water, or holy water if you'd like.

2) Add salt to one. The salt can be table salt you buy at the store, with or without iodine, sea salt, rock salt or any other type of actual sodium chloride you can buy.

3) Taste the water in both glasses. One is salty, the other isn't.

4) Add equal parts of water from both glasses to the a third glass.

5) Taste the water. It's salty, but less salty than the glass of salt water you made. That's because the two waters mixed and made a glass of water has 'saltiness' somewhere in between the fresh water and the salt waters you made.

Having said all that, well out at sea from the mouth of the Amazon, the surface water is still fresh, due to density stratification. The same effect is seen in the New Zealand Fiords, where wave action is slight.

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