 Geologically it has thick limestone layers that form the relief of the Lauregais Plateau.The "Fresquel" river rises in the south-east of the commune which is not far from the Seuil de Naurouze - the highest point on the Canal du Midi between the Atlantic and the Mediterranean - and flows north-west through the length of the commune continuing to eventually join the Aude (river) west of Villedubert.The "Ruisseau de Labexen" flows from the south-east and forms the southern border of the commune where it becomes an arm of the Lac de la Ganguise, a lake created by the Ganguise Dam.