Route & map
A tide-assisted Thames corridor through West London.
At the inaugural Swim London on Sunday 6 September 2026, the 10 km course ran from Brentford, first wave 11:15, and the 5 km course from Barnes, first wave 12:10. Both finished at Putney Embankment, outside Imperial Boathouse, with the first swimmers home between 13:00 and 14:00.
10 km first wave
11:15
Brentford — Sunday 6 September 2026
5 km first wave
12:10
Barnes — Sunday 6 September 2026
First finishers
13:00–14:00
Putney Embankment, outside Imperial Boathouse
Finish: Putney Embankment, outside Imperial Boathouse. Both distances finish here on Sunday 6 September 2026, with the event village, awards and refreshments at the finish.

10 km
Brentford to Putney — first wave 11:15
- Brentforddownstream
- Kewdownstream
- Chiswickdownstream
- Hammersmithdownstream
- Putney Embankment (outside Imperial Boathouse)
5 km
Barnes to Putney — first wave 12:10
- Barnesdownstream
- Hammersmithdownstream
- Putney Embankment (outside Imperial Boathouse)
Route summaries only, not exact swimmer navigation. Start access points, wave arrangements and detailed course information are confirmed in the participant guide for each edition.
10 km — Brentford to Putney
First wave leaves Brentford at 11:15, heading downstream through West London to finish at Putney Embankment, outside Imperial Boathouse.
5 km — Barnes to Putney
First wave leaves Barnes at 12:10, swimming downstream past Hammersmith and Craven Cottage to finish at Putney Embankment, outside Imperial Boathouse.
Tide-assisted
Both courses swim downstream on the tide. The river works in your favour, carrying you towards Putney rather than against you.
The Boat Race, in reverse
Downstream, in early autumn, familiar London water, run the other way.
Swim London’s corridor follows the tidal Thames through West London. Depending on your distance, you’ll enter the river at Brentford (10 km) or Barnes (5 km), swim downstream past Hammersmith and Craven Cottage, and finish among the boathouses at Putney Embankment, outside Imperial Boathouse.
The tidal push moves fast — a noticeably faster current than swimmers experienced at the Paris Olympics. Supporters can follow along the Thames Path towards Putney.


A living river
Herons, seals and migrating fish share the water.
Eagle-eyed swimmers may spot grey herons around the London Wetland Centre at Barnes. Seals are seen following the tides up through Barnes and Kew, hunting fish in the shallows. Sea trout and European eels still migrate this stretch, and smelt spawn in the gravel beds around Putney — porpoises have even been sighted surfacing in the reach.
