RunThrough Run Dorney Lake Half Marathon December 2026

RunThrough’s Dorney Lake December race is a flat road-race held at the purpose-built rowing lake near Dorney village in Buckinghamshire. Participants can select from 5k, 10k, or half marathon distances. All races commence simultaneously in the morning, with chip timing employed for results. The venue is the former Olympic rowing site near Windsor. The course utilizes the open, level terrain surrounding the lake, eschewing city streets. This flat course presents an opportunity for runners aiming for a personal best in the shorter distances, while the half marathon offers a similar low-friction environment over a greater length. RunThrough organizes events throughout London and the UK; entry fees for this race are moderately priced, with a discount for members.