The trail follows the route of the GR-240, the long-distance trail named after Sulayr, the “mountain of the sun”, as the settlers who inhabited these magnificent mountains called it centuries ago. The name of the Lastonar pass describes the type of alpine pasture that usually covers these rough mountain terrains, accompanied by pilgrims, hawthorns and barberries. The GR-240 section is the most comfortable part to run, ideal for lovers of fast and easy tracks, without unevenness. The path passes by the cattle buildings of the Corral de Prado Largo and continues skirting the mountains along the edge of the pine forests. At Morrón del Tío Justo, the track turns to the left and descends from the mountains. The trail continues straight ahead through the Sulayr and returns to the technical and fun trail, passing through the bottom of a ravine and down to Refugio de las Chorreras, suitable for hikers and mountaineers. At the door of the refuge there are signs for the GR-240 and signs for the PR-A 333 path that goes down to the town of Aldeire. Las Chorreras is the lowest point of the trial, now it remains to go up to the Cabañuela pass through the pine forests of the mountains. The hardest slope is the forks of La Rinconada, then the path leaves the forest and ends the ascent on the slope of Morrón de la Cabañuela.