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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 about six hours and then north towards Troy for another six. Native Americans recognized the tidal nature of the river, calling it Mahicantuck, which loosely translated 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