Money raised will be used to further the mission of Three Bays to clean up the estuaries.
The race is a test of speed and endurance for stand up paddle-boarders and kayakers on courses of varying difficulty.
The race begins at Ropes Beach in Cotuit on Saturday, September 20. Registration begins at 7 a.m.
The night before the race, a dinner for participants will be held at Veteran’s Hall in Osterville from 6 to 9 p.m.