Explore Britain's oldest path, the Ridgeway, on this epic ultramarathon offering stunning 50K or 100K routes through the stunning Chiltern Hills AONB and North Wessex Downs AONB, en route to the finish line at the mythical UNESCO World Heritage Site, Avebury Stone Circle.
Expect a superb level of support and organisation, on the UK's favourite ultramarathon, with fantastic overnight options at the all-inclusive Basecamp.
An unforgettable route running towards the UNESCO World Heritage Site of Avebury stone circle.
World class support whether you set the record or make the most of extended cut offs.
A fantastic mix of woodland, riverside and ridge trails without the need for technical skill.
Extended cut off times and medical support at every stage make it the a fully accessible Ultra.
Join our community of thousands of Ultra runners and walkers for guidance, support and camaraderie.
Full event details including location, route and photo gallery are on the Day One | Thames Valley 50K listing.
These charities have places in the event. To secure your place, select a charity and complete the form to ask a question or get signed up.
Mental health
Supporting those affected by mental illness to change mental health for good.
Sign up
£40
Fundraise
£350
Cancer
No one should have to face cancer alone.
Sign up
£40
Fundraise
£350
Health and Medical
Find a cure and improve life for everyone affected by Parkinson’s.
Sign up
£40
Fundraise
£350
Each year, this event raises millions of pounds for charity. You can chose to make your miles mean more by opting to fundraise for one of these charities.
You will get up to 74% off your registration fee and your chosen charity will part-fund your place and will provide you with all the support and materials to help you reach your target. In return, you'll raise sponsorship for the charity.
