(anc. geog.), the fountain of song, was situated in Magnesia, a district of Macedonia annexed to Thessaly; distinct from the town of Libethra, which stood on the mount Olympus, where it Libethrius verges towards Macedonia; hence the Muses are called Libethrides (Virgil). Strabo places on Helicon, not only Hippoereum, and the temple of the Muses, but also the cave of the nymphs Libethrides.