Correction for the size of Alcatraz
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How big is 1,970 arpents?
It's about 75 times as big as Alcatraz
The size of Alcatraz is about 26 arpents.
(a.k.a. The Rock) (California)
Alcatraz Island measures 26 arpents. 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.