Senpereko Trail is the main race at the Senpere event, starting at 9:00 from the fronton in Ibarron, a neighborhood of Saint-Pée-sur-Nivelle, or Senpere in Basque. It is a hilly trail race in the Basque Country, approximately 21 to 21.5 km long, with 1,050 m of elevation gain.
The route crosses the hills and forests of the area, utilizing old paths, green pastures, and local oak woods. Runners gain wide views toward La Rhune and the nearby mountains, indicating the race emphasizes steady climbing and Basque countryside terrain over flat-road speed.