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The river Landistou [fr], a 12.5 km long tributary of the Béez, passes through the village Lys. Several tributaries of the Landistou (Betbeder, Bonnasserre, Chourrup, Lazerau, Lespereu) also pass through the commune.[3] The northern part of the commune is drained by the river Luz [fr], a 15.2 km long tributary of the Gave de Pau, and some of its tributaries (Gest, Herran, Luz de Casalis).[4] The southern part of the commune is drained by the stream Ruisseau de la Fontaine de Mesplé (Béez basin), and its tributary Ruisseau de Subercase.[5]