How does the Atlantic cut through Eastern USA and flow back into itself? And what happens to all the salt?

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[This is a general outline of the connectivity.](https://imgur.com/7PKkovd) How do the Great Lakes end up as fresh water if there is a constant flow in from the salty Atlantic? And where does the water get the energy to flow in this way?

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This is not accurate the Atlantic does not flow into the great Lakes. Rain from a large portion of the US and Canada drains into the great Lakes or other rivers which then flow into the atlantic.

Water flows from the great lakes and rivers into the Atlantic because they are higher up. Stuff flows down hill.

The map is wrong. The water starts from the Great Lakes and flows to the oceans on both sides. The Great Lakes gets its water from rainfall and other smaller rivers feeding it, which also gets their water from rainfall.