Lower German Limes

The Lower German Limes was the frontier of the Roman province of Germania Inferior, following the left bank of the Lower Rhine for about 400 km from the Rhenish Massif in Germany to the North Sea coast of the Netherlands. In the 2nd century the frontiers of the Roman Empire stretched more than 7,500 km across Europe, the Near East and North Africa. Here the border was not a wall or ditch but the river itself.

The decision in AD 16 not to conquer the lands east of the Rhine turned the river into a fixed frontier of the empire. Along it the Romans built legionary fortresses, forts, watchtowers, roads, harbours, a fleet base, a canal and an aqueduct, and towns, cemeteries, sanctuaries, an amphitheatre and a palace grew up beside them. Many military sites were rebuilt from earthen camps to timber and then to stone, especially after the Batavian revolt of AD 68–69.

In the 450s the Franks took control of Cologne, ending Roman rule on the Lower Rhine. Almost all the remains lie underground, and waterlogged soils have preserved even timber and other organic material. The 102 components in the Netherlands and Germany were inscribed as a World Heritage site in 2021.