Correction for the size of Alcatraz
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How big is 9,870,000 thousands of circular mills?
It's about one-twenty-thousandth as big as Alcatraz
![Flag of The US Flag of The US](/images/flags/USA.png)
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.