Correction for the size of Alcatraz
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How big is 6,909,784 city blocks?
It's about 1,500,000 times as big as Alcatraz
The size of Alcatraz is about 4.10 city blocks.
(a.k.a. The Rock) (California)
Alcatraz Island measures 4.10 city blocks. 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.