Correction for the size of Alcatraz
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How big is 20,000,000,000 thousands of circular mills?
It's about one-tenth as big as Alcatraz
The size of Alcatraz is about 180,000,000,000 thousands of circular mills.
(a.k.a. The Rock) (California)
Alcatraz Island measures 180,000,000,000 thousands of circular mills. 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.