File:Panorámica de Las Médulas.jpg
The landscape of Las Médulas is a result of ruina montium.

Ruina montium was an ancient Roman mining system. In this technique, miners would excavate narrow cavities down into a mountain, whereby filling the cavities with water would cause pressures large enough to fragment thick rock walls.[1]

References

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es:Ruina montium

fr:Ruina montium