Cueva de Mondragón. A 1.027 m. s. n. m. en la porción cimera de la Peña de Udalaitz (1.092 m.). A 310° de la cima. Entrada de grandes dimensiones y unos 40 m. de desarrollo longitudinal en recorrido ascendente. Visitada y topografiada el 7-X-1951 por Juan San Martín.
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