This 24 mile ultra-distance marathon swim race starts at the Sunshine Skyway Bridge and ends on the Courtney Campbell Causeway in Tampa in a race that covers the entire length of Tampa Bay. The event is held each year to celebrate Earth Day and the revitalization of Florida's largest estuary. It is one of the world's longest marathon swimming races, and is a part of the Grand Slam of Open Water Marathon Swimming, which also includes The English Channel, Manhattan Island, and the Catalina Island marthon swims.
Since the 24 Mile Tampa Bay Marathon Swim was first staged in 1998, it has drawn competitors from across the United States, from Great Britain, Guatemala, Italy, Mexico, Australia, Ireland, Japan, Switzerland, Baliwick of Jersey, Argentina, Dominican Republic, Germany, India, Canada, and the Cayman Islands. The race is one of the world's longest marathon swims and held annually in April, in celebration of Earth Day.