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. Attempts were made to cut a canal through this isthmus by Periander, Alexander, Demetrius, Julius Cæsar, Caligula, Nero, and Herodes Atticus; but from some cause or other these all proved abortive. A wall was afterwards built across it, and was called Hexamilum, 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 Mahomed II.