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

From this point where the Royal Roncaleses Cattle Trail crosses the road, we set off on a track heading south. After passing by a rainwater pool we come off the cattle route and head up to the first flatter area, known as Alfarillo. A long, almost flat stretch takes us through land at times belonging to the Bardenas, and at others, Aragón. The Plana de La Negra is clearly visible due to its height and dark-looking slopes covered with pines and kermes oak. A steep slope with a good surface rewards us with outstanding views from an exceptional mesa-shaped high, especially when the route takes us along the edge of the plain. Near the limits of Fustiñana, the route heads downhill, very rapidly at first. For the last stretch we join route nº 5 to return along the same track back to the start point.