What is the name of the prison surounded by water?

The prison surrounded by water is called Alcatraz Federal Penitentiary, commonly known as Alcatraz. Located on Alcatraz Island in San Francisco Bay, California, it operated from 1934 until 1963 and was home to some of the most notorious criminals in American history. The island's isolation made it a secure facility, and it has since become a popular tourist destination.