or SEA OF MARMORA, a part of the Mediterranean, dividing Europe from Asia; it has the Hellespont or canal of the Dardanelles to the southwest, whereby it communicates with the Archipelago, and the ancient Bosphorus of Thrace, or strait of Constantinople, to the north east, communicating with the Black or Euxine sea. It has two castles: that on the Asia side is on a cape, where formerly stood a temple of Jupiter. The castle of Europe is on an opposite cape, and had anciently a temple of Serapis. It is 120 miles long, and in some places upwards of 40 miles broad.