Avenc de la Nevera de Puigventós

On the BV-4243 road that climbs from Castellar del Riu to the Rasos de Peguera, at kilometre 12.9, 250 metres before reaching the Coll del Sant Crist, on the right of the road a track closed to vehicles starts and in 2.1 kilometres takes us to the Collada dels Rasets, where there is a pool of water for much of the year.

From the Collada dels Rasets we follow the track uphill towards the S, in the direction of the Torreta dels Enginyers (antenna installation); once we reach this point we continue S towards the crag; before reaching it, on the W side a small valley opens up which we follow; at the end of it we find the Pas de l'Os, a hole formed by a large block; we must pass through the gap and go down the steep slope; once at the bottom we follow the large fissure towards the W; when it turns S we will find the cavity below us among the blocks.