Longest caves in the Basque Country
The longest cave in the Basque Country in the EspeleoWorld catalogue is Sima del Hayal de Ponata VII (90,000 m), followed by Arrikrutz and Aixako Zuloa.
The longest cave in the Basque Country in the EspeleoWorld catalogue is Sima del Hayal de Ponata VII (90,000 m), followed by Arrikrutz and Aixako Zuloa.