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Correction for the size of Alcatraz

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How big is 16 acres?
It's about three-fourths as big as Alcatraz
Flag of The US
The size of Alcatraz is about 22 acres.
(a.k.a. The Rock) (California)
Alcatraz Island measures 22 acres. 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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