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225,170,600 dunams is about 20,000,000 times as big as a City Block (Manhattan)
In other words, the size of a City Block (Manhattan) is 0.0000000500 times that amount.
(per Bridges, William - 1811 Commissioner's Plan for New York City) (approximate)
A Manhattan city block measures about 200 m between the Northeast-Southwest streets by about 60 m between the Northwest-Southeast streets for a total area of about 10 dunams. There are roughly 2,000 blocks within the city, representing one of the most prolific applications of the city planning grid plan in history.
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