Correction for the size of Alcatraz
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How big is 1.240 virgates?
It's about one-and-seven-tenths times as big as Alcatraz
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The size of Alcatraz is about 0.730 virgates.
(a.k.a. The Rock) (California)
Alcatraz Island measures 0.730 virgates. 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.