a mountain in Thessaly, extending along the coast of Magnesia, and rising to the S. of Mount Ossa, with which it is joined by a low ridge. It attains to its greatest height (nearly 5000 feet) above Iolcos. Its eastern side rises precipitously from the sea, rendering the coast exceedingly dangerous, as the destruction of Xerxes' fleet can testify. It is still covered with venerable forests of oak, ash, beech, elm, and pine, as of old, when Homer gave it the epithet of ἐρυθρόπυλος, "quivering with leaves" (II. ii. 632, &c.); and when its ashen spear-shafts were so famous that Pelias was the usual name by which the celebrated spear of Achilles was designated, and which no arm but his own could wield. The timber of which the ship "Argo" was built is likewise said to have been felled in the forests of this mountain. In the wars of the giants and the gods, the former are said to have piled Ossa upon Pelion in order to scale Olympus. The N.W. summit of Pelion is called Plessidhi; and the whole mountain frequently gets the name of the town Zagora, built on its eastern side. (See Leake's Northern Greece.)