Correction for the size of Alcatraz
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How big is 0.0000000460 virgates?
It's about 0.00000007 times as big as Alcatraz
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.