Dumbarton (17), the county town of Dumbartonshire, and a royal burgh, at the mouth of the Leven, on the Clyde, 15 m. from Glasgow; shipbuilding the chief industry; it was the capital of the kingdom of Strathclyde; adjoining is a castle of historic interest, 250 ft. high, kept up as a military fortress; the county, which is fertile, and was originally part of Lennox, is traversed by the Leven, with its bleach-fields and factories.