The Metéora (Greek: Μετέωρα, pronounced [mɛˈtɛoɾɐ], lit. "middle of the sky", "suspended in the air" or "in the heavens above" — etymologically related to meteorology) is one of the largest and most important complexes of Greek Orthodox monasteries in Greece, second only to Mount Athos. The six monasteries are built on natural sandstone rock pillars, at the northwestern edge of the Plain of Thessaly near the Pineios river and Pindus Mountains, in central Greece. The nearest town is Kalambaka.