The borders of the Roman Empire in southeastern Europe was the River Danube. Part of the border in Western Europe was the River Rhine . These provided a degree of protection. Garrisons were placed along the banks of the rivers. In an area of Germany between these two rivers the Romans built the limes Germanicus, a 568 km (353 miles) long system of fortifications with a series of walls and at least 58 forts and 900 watchtowers (some of them might not have been recovered by archaeologists.
In northern England the Romans built Hadrian's Wall, a wall which was 117.5 km (73 miles) long and run from coast to coast. There were 80 fortlets which could host perhaps 20-30 soldiers (they are called milecastles because they were built at intervals of a Roman mile) which guarded a guarded a gateway through the wall. These were stone watchtowers placed about 1/3 of a Roman mile on ether side of the fortlet. There were 14 to 17 full size forts which could host 500-1,000 troops.
The name of the wall that protected the roman empire from barbarian invaders is called Hadrian's Wall. Hope that helped! ;D
Hadrian's wall was built by the Emperor Hadrian on the border between England and Scotland to protect Roman England from marauding Scots.
The southernmost border was the one between southern Egypt ad Numidia
roman sa
River Meuse
Drava.
The Emperor - that was his role.
The Mediterranean Sea
The Ebro River.
The flooding in of Eurasian peoples.
Danube.
Rome protected the empire by use of its military.Rome protected the empire by use of its military.Rome protected the empire by use of its military.Rome protected the empire by use of its military.Rome protected the empire by use of its military.Rome protected the empire by use of its military.Rome protected the empire by use of its military.Rome protected the empire by use of its military.Rome protected the empire by use of its military.