Dumbarton (/dʌmˈbɑːrtən/; also Scots: Dumbairton; from Scottish Gaelic Dùn Breatann or Dùn Breatainn 'fort of the Britons' pronounced [t̪umˈpɾʲɛʰt̪ɪɲ]) is a town in West Dunbartonshire, Scotland, on the north bank of the River Clyde where the River Leven flows into the Clyde estuary. In 2006, it had an estimated population of 19,990. Dumbarton was the capital of the ancient Kingdom of Strathclyde, and later the county town of Dunbartonshire.Dumbarton Castle, on top of Dumbarton Rock, dominates the area. Dumbarton was a Royal burgh between 1222 and 1975.