A 100 mile point-to-point ultramarathon following the Thames Path National Trail from Richmond to Oxford (direction may vary by year). The route traces the river corridor on largely flat terrain, using towpaths, parkland trails and occasional road sections. Elevation gain is minimal, making the challenge primarily distance-based. Aid stations are positioned at intervals along the course in accordance with organiser logistics.

• Other races at the same event:
Thames Trail 50 Mile Ultra Marathon