What Is the Thames 200 Ultra?
The Thames 200 Ultra is Europe's longest single-river continuous paddle race — 200 kilometres down the full navigable, non-tidal stretch of the River Thames, from Lechlade to Teddington. First run in August 2024, it's open to K1, K2, open canoe, SUP and prone paddleboard, and to solo paddlers, doubles, and relay teams alike. Few races ask this much of a paddler in one go, and fewer still let a first-timer and a GB team paddler line up on the same start line.
The Course: Source to Tide
The route runs the length of the river from its upper reaches near Lechlade down to the tidal limit at Teddington, broken into six legs of roughly 30 kilometres each, all running with the current. Checkpoints along the way handle safety, GPS tracking, and nutrition support, and for relay teams, they're where the crew change happens. Straight-through racers just keep going.
Solo, Doubles, or Relay — Race Your Way
That checkpoint structure is what makes the distance work for more than just hardened marathon specialists. Straight-through paddlers take on all 200km non-stop, which for the fastest crews means somewhere in the 16-to-20-hour range through a full day-night-day cycle. Relay teams split the legs between two or more paddlers, which opens the race up to club crews, adventure racers, and anyone building toward their first ultra rather than defending a title.
Every Craft Welcome
Different disciplines get different start times to keep the field together at the finish: SUP, prone, and slower kayaks typically go off around 10am, with the faster K1/K2 and canoe crews starting later in the early afternoon. Each craft chases its own records — the current fastest solo SUP crossing sits at just over 29 hours, and the fastest relay times have come down into the low 16-hour range.
History in the Making
2024 was the inaugural edition — around 100 competitors, backed by Paddle UK and fronted by naturalist and former Thames record holder Steve Backshall MBE, directed by multiple Devizes to Westminster record holder Keith Moule. Paddlers got their first taste of night navigation on the river, with more than one crew finding out the hard way what a wrong turn near a weir in thick mist does to a lead.
2025 saw the relay race tighten up considerably, with the winning crew from Richmond Canoe Club holding off the previous year's runners-up by a margin of just six minutes after 200km of racing. The 2026 edition ran on 29–30 August, and the 2027 date is already locked in for 28–29 August — worth getting in the diary now if you're training toward it.
Training for 200km
This isn't a race you turn up to off the back of a normal marathon-paddling programme. A few things worth building into your prep:
- Back-to-back long days. Straight-through racing means paddling through a full night — get comfortable on the water in the dark before race day, not during it.
- Navigation under fatigue. Missed turns and weir mix-ups have cost real crews real placings in the dark hours. Know the course, not just the distance.
- Pacing for ultra, not marathon. What holds up over 20km falls apart over 200. Dial your effort back earlier than instinct tells you to.
- Crew logistics, sorted early. If you're racing relay, checkpoint handovers need to be rehearsed, not improvised.
- Hydration and fuelling on a schedule, not on feel — by hour 12, feel is not a reliable guide.
Ready to Race the Thames?
Whichever discipline you're bringing to the start line at Lechlade, it's the kind of race that separates paddlers who've trained for distance from paddlers who've only trained for speed. If that's where your season is heading, our ENDURE Vector range was built for exactly this kind of graft — details in the shop.