CORINTH, the Isthmus of, in the Morea, is a neck of land which joins the Morea to Greece, and reaches from the gulf of Lepanto or Corinth, to that of Ægina. Perander, Alexander, Demetrius, Julius Cæsar, Caligula, Nero, and Herodes Atticus, all attempted to cut a channel through it, but in vain, owing, it is said, to the difference in the level of the water on the two sides of the isthmus; and they therefore afterwards built a wall across it, which they called Hexamilium, because it was six miles in length. This was demolished by Amurath II. and afterwards rebuilt by the Venetians, but was levelled a second time by Mahommed II.