En el raso de Obas en la sierra de Urbasa, camino del puerto de Lizarraga hacia Eskiza a una hora aproximada del puerto y a mano izquierda, grieta de unos 10 m. Latitud: 42° 51' 55"; longitud: 1° 36' 55". Altitud: 1 .030 m. Visita el 1-IV-1972. Cfr. Catálogo Espeleológico Navarro (1980).
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