is ayrshire in the lowlands?
For other purposes, the boundary varies; but if the Boundary Fault is used, then the traditional Scottish counties entirely in the Lowlands are: Ayrshire, Berwickshire, Clackmannanshire, Dumfriesshire, East Lothian, Fife, Kinross-shire, Kirkcudbrightshire, Lanarkshire, Midlothian, Peeblesshire, Renfrewshire, ...