20 September 2025 | Back up 21 September 2025
Discover stunning vistas both above and below the water's surface, all while championing conservation in this iconic race.
Navigate over sea grass forests and a sanctuary for seahorses, culminating in the renowned chalk stacks.
Enter the 5km for a swim out to Old Harry Rocks, before turning back to shore.
Enter the 2.5km challenge which involves a swim from the beach to Old Harry Rocks, where you'll be extracted by powerboat for an exhilarating ride back to shore to wrap up your mega day!
Our commitment to a light ecological footprint means a single registration tent, one convenient bag drop, no onsite sales, and minimal buoy placements—preserving the delicate seagrass ecosystem.
Join us in supporting The National Trust's ongoing efforts at this exceptional location. Embrace the adventure while making a positive impact!
Knoll Beach, Studland, Dorset BH19 3AH | 20 September 2025 (back up 21/09/25)
What’s included
Finisher's tee -
Recieve a finisher's t-shirt on completion
Swim cap
A TWSCO swim cap to wear on the day
Lifeguards
Qualified beach lifeguards along the route
Powerboats
2.5km swimmers get a powerboat ride back to shore
Check in online
Save time on the day and check in online
What’s not included
Parking
Pay on the day, National Trust operated
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