KERESOO, or KERASAN (the ancient Cerasus), a seaport-town of Asiatic Turkey, on the Black Sea, government of Trebisond, and 75 miles W. by S. of the town of that name, in N. Lat. 40. 57. 10., E. Long. 38. 24. It is situate on a rocky promontory forming the western boundary of a spacious bay. The town, which is now in a very wretched and ruinous condition, appears to have been formerly a place of considerable strength and importance, and a considerable part of the ancient wall still exists. It has some ship-building, and carries on a small trade in corn with the Crimea. Pop. probably about 3000.