Hadrian's Wall marked the boundary between Roman Britannia and unconquered Caledonia to the north. [a] The wall lies entirely within England and has never formed the Anglo-Scottish border, though it is sometimes loosely or colloquially described as being such.

Hadrian’s Wall is located near the border between modern-day Scotland and England. It runs in an east-west direction, from Wallsend and Newcastle on the River Tyne in the east, traveling about 73 miles west to Bowness-on-Solway on Solway Firth. The wall took at least six years to complete. Construction started at the east end and moved westward.

Upon Hadrian’s death, his successor Antoninus Pius (138–161) decided to extend the Roman dominion northward by building a new wall in Scotland. The resulting Antonine Wall stretched for 37 miles (59 km) along the narrow isthmus between the estuaries of the Rivers Forth and Clyde.

Antonine Wall, Roman frontier barrier in Britain, extending about 36.5 miles (58.5 km) across Scotland between the River Clyde and the Firth of Forth. The wall was built in the years after ad 142 on the orders of the emperor Antoninus Pius by the Roman army under the command of the governor Lollius Urbicus (Quintus Lollius Urbicus).