sentences:  The northern foothills of Mocho-Choshuenco are surrounded by an arc of rivers and lakes formed by Fui, Enco and Llanquihue River, and Pirihueico, Panguipulli and Riñihue Lakes.The Fui River has high degree of underground infiltration, such that in some years the Huilo-Huilo Falls may dry out completely.As consequence of this infiltration a large aquifer is situated beneath Mocho-Choshuenco.