(Homer), the island of Calypso; placed by Pliny in the Sinus Scylaceus, in the Ionian sea, opposite to the promontory Lacinium; by Mela in the strait of Sicily, calling it Αἴαν; which others place at the promontory Circeum, and call it the island of Circe.

ancient name of Thebes in Boeotia: so called from Ogyges, an ancient king, under whom happened a great deluge, 1020 years before the first Olympiad.

OHIO, a river of North America, having its source in the Alleghany mountains, and after them is called Alleghany, till it joins the Monongahela at Fort Pitt, where it receives the name of Ohio. It bounds the state of Kentucky, and its only disadvantage is a rapid, one mile and a half long, in N. Lat. 38. 3. about 400 miles from its mouth. The breadth of this river in no one place exceeds 1200 yards, but its mean breadth may be estimated at 600 yards, and its length almost 1200 miles, according to the measurement of Captain Hutchins. The inundations of the Ohio begin about the end of March, and subside in July, although they have been known to happen frequently in other months; so that boats which are capable of carrying 300 barrels of flour from the Monongahela above Pittsburgh, have seldom very long to wait for water. It is thought that, during the great floods, a first rate man of war might sail from Louisville to New Orleans, if the sudden turns of the river, and the rapidity of its current, should be found to admit of a safe steering. The bed of the Ohio is a solid rock, and is divided by an island into two branches, the southern of which is about 200 yards wide, but impassable in dry seasons. It is the branch that may be most easily opened for a constant navigation, as the bed of the northern branch is worn into channels by the constant course of the water, and the attrition of the pebble stones carried along with it.

Ohio is also the name of the north-westernmost county of the state of Virginia, bounded on the east by the county of Washington in Pennsylvania. It contains 5212 inhabitants, of whom 281 are slaves.