Scottish lowlands

The Lowlands (Scots: the Lallans or the Lawlands; Scottish Gaelic: a' Ghalldachd, "the place of the foreigner") are a cultural and historic region of Scotland.

The Lowlands is not an official geographical or administrative area of the country. There are two main topographic regions: the Midland Valley (or Central Lowlands) and the Southern Uplands. The term "Lowlands" mainly refers to the Midland Valley. However, in normal usage it refers to those parts of Scotland not in the Highlands (or Gàidhealtachd). The boundary is usually considered to be a line between Stonehaven and Helensburgh (on the Firth of Clyde). The Lowlands lie south and east of the line. Note that some parts of the Lowlands (such as the Southern Uplands) are not physically 'low', Merrick for example reaching 2,766 feet, and some areas indisputably in the Highlands (such as Islay) are low-lying.

In geological terms, the dividing line between Lowlands and Highlands is the Highland Boundary Fault. There was also a legally defined Highland Line in the post-Culloden years, part of the measures taken to suppress Gaelic culture.

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, Mid-Lothian,Peeblesshire, Renfrewshire, Roxburghshire, Selkirkshire, West Lothian and Wigtownshire.

...
Wikipedia