What prisons called the rock?
The prison known as "The Rock" was Alcatraz Federal Prison located in San Francisco, California. It's known as the Rock because it sits atop a small rocky island in San Francisco Bay approximately one and a quarter miles off the coast of San Francisco.
Alcatraz is called the rock, once considered inescapable, it is located on a rocky island formation 1 and a quarter mile out in San Francisco Bay.
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