Chiltern Hills 100K

The Chiltern Hills 100K is a 100-kilometer ultra marathon held in the Chiltern Hills, Buckinghamshire, UK. The race features an anticlockwise loop starting and finishing in Chesham, passing iconic landmarks such as Ashridge Estate, Coombe Hill, Whiteleaf Hill, Bledlow Ridge, and Great Hampden. With over 1800 meters of elevation gain, the course follows well-marked trails including sections of The Ridgeway National Trail.

The event supports GPS tracking and has six aid stations offering hydration, nutrition, and restrooms. Limited to 250 runners aged 20 and above, the race is TRA licensed and part of the UTMB World Series. The event base is Chesham Guides HQ, providing post-race food and facilities. Visit the organization's website for the most recent information.