The Scottish Lowlands is the part of Scotland not referred to as the Highlands.[1]
That is everywhere south and east of the Highland Boundary Fault, between Stonehaven and Helensburgh (on the Firth of Clyde).
Geographically, Scotland Lowlands are divided into two distinct areas: the Central Lowlands, and the Southern Uplands.
The southernmost counties of Scotland, nearest the border with England, are also known as the Borders.