The most advisable approach is from the Morera de Montsant, going up by the grau de la Grallera until reaching the Serra Major; from there we will look for the path that leads to the Comellar de l'Os, we will continue along the ridge leaving to the right the path that descends to the Comellar, continuing until reaching the channels where we will find some cavities, following a very faint trail we will arrive at a flat area that is full of dolines and furrowed crags, right above la Bitlla. This cavity opens very close to the upper entrance of the avenc de l'Aisling, in the direction of la Bitlla, above an elongated depression. Approximate coordinates without much reliability.