In the serra de l'Arca (Montmell). The best route is to take the road from la Juncosa to Aiguaviva until reaching, after some final hectometres on a steep slope, the coll de l'Arca, where we leave the cars. From the same coll a forest track (closed) heads off towards the S., which in a flat and comfortable way brings us close to the puig de la Cova (673 m). When we are practically in front of it, the track makes a pronounced bend to get around a small hill (which can be short-circuited along the firebreak) and from the right another firebreak track comes out, which climbs on a steep slope from near the mas Campanera. After a few metres the track ends, but shortly before, below it, a small col can be seen that separates the source of two ravines; it must be crossed by a path that immediately climbs to the left towards the next ridge. From it a good part of the Penedès depression can be seen and sunk at our feet runs a ravine (Fondo del Sabater) that heads towards the masies de Santsuies. From the ridge we must descend some twenty or twenty-five metres, without a path and slightly to the right, heading for some rocks where the mouth of the avenc de Carles V is found.