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A limes—plural limites—was a fortified military road of the Roman Empire. Over time, the term came to be associated with continuous barriers punctuated by watchtowers and forts. In Germany and Raetia, one such limes stretched 345 miles (555 km) along the Roman border. Though not impenetrable, limites deterred raiding parties and allowed the Romans to control communications along frontiers. In some places, they were used to guard caravan routes. What two famous limites were built across Britain? Discuss
Source: The Free Dictionary