Carter Bar is a pass in the Cheviot Hills, on the Anglo-Scottish border. It lies east of Carter Fell at the head of Redesdale, and is crossed by the A68 road as it runs north towards Teviotdale.
The name "Carter Bar" is relatively modern, and refers to a toll-gate that once stood here. Historically, Carter Bar was known as the Redeswire, from the Scots word swire meaning "col" or "pass". The Redeswire Fray, fought here in 1575, was the last significant battle between England and Scotland.
Wikipedia https://en.wikipedia.org/wiki/Carter_Bar
Address A68, TD8 6, United Kingdom
Coordinates 55°21'15.679" N -2°28'39.622" E