Correction for the size of Alcatraz
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How big is 0.000000019210 acres?
It's about 0.0000000009 times as big as Alcatraz
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.