Eton Dorney Swim Long

The Eton Dorney Swim Long, scheduled for September 20, 2026, provides a series of open water distances—2.5km, 3.8km, 5km, and 10km—held within the Eton Rowing Lake. This venue, a purpose-built Olympic facility, is separated from the adjacent river by a dedicated island, creating a consistent, stillwater environment that remains unaffected by the currents of the nearby River Thames. Participants navigate a controlled course, beginning with a mass floating start following the pre-race briefing.

The surroundings and landscape

While swimming, athletes are positioned in a landscape that blends modern sporting infrastructure with historical landmarks. To the west, the course offers views of the Buckinghamshire countryside and the quiet village of Boveney, known as the southernmost settlement in the county. Closer to the water's edge, observant swimmers may spot the Victorian Gothic silhouette of Oakley Court, a Grade II* listed house built in 1859. The area's legacy extends to the nearby Bray Film Studios, a site historically significant for its association with the production of many Hammer Film titles. Further along the river corridor, the wooded, unpopulated island of Bush Ait sits near the mouth of the Clewer Mill Stream, marking the transition toward the Windsor Racecourse Marina. Swimmers looking for a different challenge earlier in the season may consider the Thames Marathon, which takes place in August and explores the flowing, river-based characteristics of the region. The event provides basic timing support, with entry fees structured by distance: £35 for the 2.5km, £40 for the 3.8km, £45 for the 5km, and £55 for the 10km event.