Carretera de Maro, s/n, 29787 Nerja, Málaga
The caves are the formation of karstic cavities, their origin dating back millions of years. During the Triassic period, large quantities of calcareous mud settled on the bottom of the ancient Mediterranean sea, later transforming into the calcareous-dolomite marble which at present surround the caves.
During the Upper Miocene period, about 5 million years ago, drifts between the tectonic layers of Africa and Europe resulted in the creation of the Beticas mountains, including the Sierra Tejeda and Almijara. The abundant rain of the last 5 million years (Upper Miocene and Lower Pleistocene) infiltrated the fissures of marbles, stimulating its further dissolution.
Huge cavities, in which the underground waters circulated, were thus formed. Later, due to mountain slides in the region, the subterranean waters were forced into the lower layers and, as a consequence, the caves started to refill with carbonate deposits, stalactites and stalagmites.
In the last 800,000 years (Middle Pleistocene and Holocene) the impressive stalactites and stalagmites have formed following further settling of calcite.