It is a solutional limestone cave, formed by Jurassic sedimentary rock that rose from the ocean as the Andes emerged during the Cenozoic Era.

Further erosion occurred at the end of the last Ice Age, when precipitation was much higher than today.

The Witches' Cave is home to many speleothems (such as stalactites and stalagmites), deep underground water galleries, and large vaulted spaces called Sala de la Virgen (Virgin Room) and Las Flores (The Flowers).

[citation needed] The site is one of the major tourist attractions in southern Mendoza, but visitors are only granted access (with a guide and proper equipment) to the first 200 metres (660 ft) of galleries, which are already damaged.

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