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which geographic features protected the roman empire from barbarian invasions until the 4th century A.D

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Answer:Geographic featured that acted as norther borders of the Roman Empire at its height were: Rhine River, Danube River, Carpathian Mountains, and the Black Sea.

User Anbusekar
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Answer:the alps

Step-by-step explanation:

barbarians couldn't pass it

User Sangam Belose
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