Thames Ring 250

Streatley, United Kingdom • 23 Apr 2025

The Thames Ring 250 is an iconic 250+ mile race that takes participants on a challenging loop from Goring along the River Thames into London, then up the Grand Union Canal and down the Oxford Canal back to the Thames. First held in 2009, it is known for its difficulty, with a high DNF rate. Runners have 100 hours to complete the course, with checkpoints every 25 miles offering support and rest options. The event includes tracking, first aid, and optional merchandise, with all finishers receiving a unique medal. The current course record is just under 60 hours. Visit the organization's website for the most recent information.

Race information

250 mi
250 Miles
Visit the organization's website for the most recent information.
Trail runs nearby

A scenic 10 mile trail run through North Milton Keynes parkland featuring the low, narrow Cattle Creep tunnel under the Grand Union Canal. The single lap course is canicross friendly and includes chip timing, water stations and marshal supp..

Join the Irchy Park 5k canicross at Irchester Country Park on Sunday 8 February 2026 for a fun woodland run with your dog over grass, dirt and packed tracks. Trophies, medals and dog treats await all finishers.

Loop races at two Chalfont St Peter venues let runners choose on the day between 7k or 10k loops and longer distances up to ultra marathons. Courses are marked, have one aid station, and allow large drop bags for gear changes.

Take on Any Kind of Weather Runner at Northampton Active on 21 February 2026, a lap based six hour challenge where you can choose distances from 5K up to an ultra. Limited to 80 entrants, enjoy aid stations, a finishers medal and a goody ba..