Start point: the NA-126 road from Tudela-Tauste, kilometric point 22

The start point is located very close to the junction between the NA-126 and the Royal Roncaleses Cattle Trail. From here we head north on a gavel track. After going up to one of the flatter areas, from which the prominent Peña del Fraile can be seen, the track descends to the Valdenovillas ravine. We follow the ravine for a long stretch, coinciding with the Royal Roncalese Cattle Trail. When we reach the top of the ravine, amidst the pine groves of the Caídas de La Negra, the route changes its tranquil and comfortable profile for a steep ascent along a stony surface. After two kilometers of effort we come to the mesa-shapped high of the Negra, where we can get our breath back. A well-surfaced track and a final uphill stretch take us to the Sancho Abarca Sanctuary. The same route is taken for the return journey.