The Korykio Andro / Corycian Cave is located on the slopes of Mount Parnassus, in Greece. In the mythology of the area, it is named after the nymph Corycia.  She was related to the nymph, Castalia, who presided over the sacred springs at Delphi.  A modern name for the cave in some references is Sarantavli, meaning "forty rooms". This cave was sacred to the Corycian Nymphs and the Muses, and a place of worship for Pan. In Greek mythology, Corycia was a naiad who lived on Mount Parnassus in Phocis. Her father was the local river-god Kephisos or Pleistos of northern Boeotia. With Apollo, she became the mother of Lycoreus.

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Strabo, in his Geography, writes: The whole of Parnassos Mountain in Phokis is esteemed as sacred to Apollo, since it has caves and other places that are held in honor and deemed holy. Of these the best known and most beautiful is Korykion, a cave of the Nymphai bearing the same name as that in Kilikia in Asia Minor.

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An excavation by French archaeologists in 1969 produced a plethora of objects of antiquity including a rare Neolithic male figurine, Mycenaean shards, bone flutes, iron and bronze rings, miniature bronze statues, 50,000 terracotta figurines from the classical period and 24,000 astragaloi, or "knucklebones" (used for astragalomancy, or "prophecy by knucklebones"). Traditionally the cave has been a place of refuge for the surrounding population during foreign invasions e.g. from the Persians (Herodotus, 8.36) in the 5th century BC, the Turks during the Greek War of Independence, and from the Germans in 1943.

King Otto and Queen Amalia made a royal tour with 100 torchbearers to view the two chambers of the cavern which is enormous at 100 m long, 60 m wide and 30 m high.