Correction for the size of Alcatraz
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How big is 1,550,000 hectares?
It's about 150,000 times as big as Alcatraz
The size of Alcatraz is about 8.90 hectares.
(a.k.a. The Rock) (California)
Alcatraz Island measures 8.90 hectares. 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.