Start point: the NA-125 from Tudela-Ejea de los Caballeros, kilometric point 17.3

At the start point, where the Royal Roncalese Cattle Trail crosses the road, there is a small clearing for parking. We start the route heading north, initially following the cattle trail. The first part of the route is quite winding in nature, with continuous uphills and dowhills. It passes through a desert-like landscape inhabited by rainwater-formed gulleys, ravines, stony hills and flatter areas. At the furthest point, near the spot known as Sagasti, we have a view of La Blanca depression and the ravines of the Rincón del Bu Nature Reserve. A long descent takes us to the Tudela-Ejea road, which we take for a few metres before almost at once taking a track which comes over the Junquilla ravine (heading towards Fustiñana). Before reaching Portimayor, a hill which marks the Bardenas limits, a turning at a crossroads takes us back to our start point, passing by the spot known as Marrapate.