Mannahatta: A Natural History of New York City | 
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The reason for the strange tides are because the East and Hudson Rivers aren't rivers so much as extensions of the sea that rise and fall with the tides. That, combined with how waters from the East River meet with the waters coming through the Long Island Sound, makes for some strange tides.
The Collect Pond was a pond in lower Manhattan that served as New York City's freshwater drinking supply for the first two-hundred years of its history.
