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Thames Ring 250

Name: Thames Ring 250
Start: 2025-04-23
End: 2025-04-23
Location: Streatley

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.

United Kingdom East of England Streatley

Race information

Registration

250 mi

250 Miles

Visit the organization's website for the most recent information.

Trail runs nearby

Tuesday May 5

Outrun Archway

Archway

6 km

Group runs led by queer folks that prioritize an inclusive space while exploring the trails and unpaved surfaces of north London. Meetings are at the entrance to the turf at Whittington Park and routes are about 6k.

Saturday May 9

Chiltern Hills 100K

Chesham

100 km

A 100-kilometre anticlockwise loop through the Chiltern Hills, the race follows The Ridgeway and local trails with six checkpoints, marked navigation and open GPS tracking. The event is based in Chesham and limited to 250 runners.

Sunday May 10

The Greenway Challenge

Letchworth Garden City

13 mi

An approximately 13 mile self guided loop around the Garden City Greenway starting and finishing at Standalone Farm, organised under UKA rules with a three hour time limit and proceeds donated to the charity GRIT.

Sunday May 10

Chilterns 30km

Tring Station

30 km

A one day 30 km trail run in the Chiltern Hills near Tring with guided trail technique instruction, a well stocked checkpoint and a finisher's medal. The route runs through woodland, ridge lines and rolling hills with about 500 m ascent.