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11. The Lower Hudson - A Long Arm of the Sea

The lower Hudson south of Troy is a long arm of the sea, influenced by the Atlantic Ocean's high and low tides. Rising and falling tides on the Hudson cause the river's currents to switch direction - alternately flowing south towards the sea for a few hours and then north towards Troy. Native Americans recognized the tidal nature of the river, calling it Mahicantuck, which means "river that flows both ways."

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High and low tide at Poughkeepsie
High tide [left] and low tide [right] at Poughkeepsie