From Openwaterpedia
Millennium swimmer Eoin O'Riordan being honored for his Millennium Swim around Sandycove Island with Centurion Robert Bohane in Cork, Ireland

noun - Centurions are elite open water swimmers who have made the crossing or specific open water swim at least 100 times. The Centurions are members of the Alcatraz 100 Club or those swimmers who have swum between Alcatraz Island and Aquatic Park in San Francisco Bay in California at least 100 times.

Alcatraz Swim with Centurions

Alcatraz Swim with Centurions is a 1.25-mile bay swim from Alcatraz Island to Aquatic Park with the Centurions, that is organized by Water World Swim.

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