The Breizh Oxygène Trail begins in Plounéventer, a village in Finistère, western Brittany. It provides several trail races instead of a single road race distance. Participants can select from three courses: a 21 km race featuring 550 meters of elevation gain, a 10.5 km race with 220 meters of climbing, and a 6.5 km option that includes 35 meters of ascent.
The courses traverse the countryside surrounding Plounéventer, including wooded paths and open meadows. The longest race presents a more challenging, hilly trail experience, while the middle and shorter distances cater to those seeking a less demanding off-road run. The entry fees are set at 10 EUR for the 21 km, 8 EUR for the 10.5 km, and 6 EUR for the 6.5 km.