Correction for the size of Alcatraz
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How big is 24,000 square perches?
It's about seven times as big as Alcatraz
The size of Alcatraz is about 3,500 square perches.
(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.