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Rain and snow falling across this land in the Catskills, 70 miles up the Hudson River, supply roughly 90% of New York City’s water.
Combined, these patches of city-owned property would roughly equal the size of New York City minus Staten Island. NYC is buying even more land to block development and pollution, and to avoid building another filtration plant.
In addition to city-owned land, half of the watershed is either state owned or privately owned but under forest, farm or conservation plans designed to protect water from pollution.
That's a chunk of wilderness the size of this 3-bedroom apartment near Union Square. So, in a sense, you do have a yard!

Hydration, Hydration, Hydration