Dunbartonshire or the County of Dumbarton is a historic county, lieutenancy area and registration county in the west central Lowlands of Scotland lying to the north of the River Clyde. Dunbartonshire borders Perthshire to the north, Stirlingshire to the east, Lanarkshire and Renfrewshire to the south, and Argyllshire to the west. The boundaries with Lanarkshire and Stirlingshire are split in two owing to the existence of an exclave around Cumbernauld.