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530 square perches is about one-tenth as big as Alcatraz.
In other words, it's 0.150 times the size of Alcatraz, and the size of Alcatraz is 6.70 times that amount.
(a.k.a. The Rock) (California)
Alcatraz Island measures 3,500 square perches. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.
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