Blatobulgium
Dumfries and Galloway, United Kingdom
Blatobulgium was a Roman fort, located at the modern-day site known as Birrens, in Dumfriesshire, Scotland. It protected the main western road to Scotland. It was one of the "outpost forts" outside the Roman Empire when the frontier was on Hadrian's Wall and was located about 11 miles from the Castra Exploratorum fort (Netherby, Cumbria).
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).