Blatobulgium

A map of Roman sites in northern Britain c. 84, including Blatobulgium (marked as 'Birrens').
Roman forts and roads in the north of England around AD 130
Plan of Blatobulgium
Western edge of the fort
Birrens Lidar image

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).