Just west of the village of Os de Balaguer a narrow valley known as the Barranc dels Vilars is home to around 80 routes situated on both sides of an impressive gorge. The rock is generally vertical and the climbing technical and fingery. During the winter months the number of south-facing sectors here makes ‘Os’ a popular destination for both locals and overseas visitors alike, but in fact the variety of orientations on offer means climbing is actually possible throughout the year.