Sima guipuzcoana situada en la zona kárstika de Deguria, en término de Aretxabaleta. Su cota de acceso se sitúa a 980 m. con las siguientes coordenadas: 1° 12' 05" long. y 42° 58' 16" lat. Alcanza una profundidad de 502 m. sobre 400 m. de longitud total.
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