Together with the Danube, it was a defensible line against incoming Eurasian nomads.
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Hadrian's Wall in Britain the Danube River in Continental Europe
The north-eastern part of the Roman Empire was formed by only one river: the Danube. The whole of the northern boundary of the Roman Empire was demarcated mostly by two rivers: the Danube and the Rhine. The latter marked the north-western frontier.
The areas to the west of the Rhine, the south of the Danube and some adjecent areas were in the Roman Empire.
the rhine:gaulish renos the rhone:rhodanus and the po: boii
the soldiers were watching out for the roman movement of tribes that cross the river