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Which ancient Roman frontier site extends into Hessen?
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Hessen
Frankfurt am Main, Germany.
The ancient Roman frontier site that extends into the German state of Hessen is the Upper GermanāRaetian Limes.1
The limes served as a system of Roman military fortifications, consisting of roads, watchtowers, and forts that marked the boundaries of the empire. In 2005, the Upper GermanāRaetian Limes was designated as part of the Frontiers of the Roman Empire UNESCO World Heritage site, which includes sections located within Hessian territory.21