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Mortillano System
0.7
Cantabria, Spain 
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Popularity in Country: 1142 of 1161
Popularity in Category: 375 of 391
Popularity Worldwide: 28227 of 29088
Caves & Underground Places
Speleology
Samuel March 13, 2025
0
If you can, visit on a weekday instead of the weekend. It was way less crowded when I went on a Tuesday, so I really got to enjoy the underground formations without bumping into loads of other tourists.
Lucas February 4, 2025
0
Make sure you wear proper shoes! I had some issues with slippery areas because I underestimated the terrain. A sturdy pair of hiking shoes will not only keep you safe but also more comfortable
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