Going along the Campgràs track to the Morella, once past the bed of the Fondo de les Terradelles (boundary of the landfill), on the left are the ruins of the old Campgràs corral. From this point you must climb up along the line of maximum slope in the direction of the radio installation located at the easternmost end of the Serrat de la Morella. About 80 or 100 metres from the corral we will find a very visible aladern and just above it is the entrance of the Avenc Muntan-Bordas.