Correction for the size of Alcatraz
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How big is 179 square miles?
It's about 5,000 times as big as Alcatraz
The size of Alcatraz is about 0.034 square miles.
(a.k.a. The Rock) (California)
Alcatraz Island measures 0.034 square miles. 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.