Thames Ring 250

The Thames Ring 250 is an iconic 250+ mile ultramarathon that takes participants on a challenging loop from Goring along the River Thames into London, up the Grand Union Canal, and back down the Oxford Canal. First held in 2009, this race features a high difficulty level, with a DNF rate exceeding 55%. Runners have 100 hours to complete the course, with well-stocked checkpoints every 25 miles.

The event includes tracking, first aid support, and optional merchandise. Finishers receive a unique and heavy medal, making it a memorable achievement for all participants. Visit the organization's website for the most recent information.