The Cave of the Lakes (Greek: Σπήλαιο των Λιμνών, romanized: Spilaio ton Limnon), formerly called Troupisio, is located near the village Kastria in the municipality of Kalavryta, Achaea regional unit.

During the winter when the snow melts it is transformed into a flowing river with waterfalls.

[citation needed] It is mentioned in the writings of the ancient traveller Pausanias.

[2] According to Greek legend, it was in this cave that Melampus cured the two of the three daughters of Proetus, king of Tiryns, Lysippe and Iphianassa.

On the lower level of the cave, fossilized bones of humans and various other animals, including hippopotamus, have been identified.