The route is a mid mountain journey the features that standout are the Pas cottages, the vertical, strong landscape changes dominated by rivers and lastly the natural habitats in productive unity within the grass: beech forests and Atlantic lands. Most of the significant animal species are predatory, there are also some rare birds.At the beginning, we follow a zigzag path with small widened stretches to ease our walk, following Ruyemas river in a setting of oak grove regeneration. Soon, our path turns left towards the cottage neighbourhood of Colina. The ascent crosses some cottages to give an impressive view of the Agualas valley, Monte Las Garmas and the Pandillo valley.Once in Cerro de La Vara, at the feet of Castro Valnera, we go into the beech forest next to Lelsa, at an altitude of almost 1,200 metres. We then reach Colina, turning south and taking a level curve as a reference. We now go around the birthplace of Ruyemas river, at the feet of El Castro, Peña Negra and El Rostro. We easily reach the cottage neighbourhoood of Ruyemas in less than an hour.The return can be done following the right riverside or, if prefered, lengthen the route, taking PR-S76 towards Monte Las Garmas, rising up the hillside and transiting along an old pathway that goes into a magnificent beech forest with a mature population of Vaccinium myrtillus.The journey, included in the European network NATURA 2000 and in the LIC “Montaña Oriental”, will let us see some notable fauna.