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200,000 square meters is about two times as big as Alcatraz.
In other words, it's 2.20 times the size of Alcatraz, and the size of Alcatraz is 0.450 times that amount.
(a.k.a. The Rock) (California)
Alcatraz Island measures 89,000 square meters. 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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