Arelate was a city of considerable importance in the province of Gallia Narbonensis. It covered an area of some 99 acres (40 ha) (400,000 mò) and possessed a number of monuments, including an amphitheatre, triumphal arch, Roman circus, theatre, and a full circuit of walls. Ancient Arles was closer to the sea than it is now and served as a major port. It also had (and still has) the southernmost bridge on the Rhône. Very unusually, the Roman bridge was not fixed but consisted of a pontoon-style bridge of boats, with towers and drawbridges at each end. The boats were secured in place by anchors and were tethered to twin towers built just upstream of the bridge. This unusual design was a way of coping with the river's frequent violent floods, which would have made short work of a conventional bridge. Nothing remains of the Roman bridge, which has been replaced by a more modern bridge near the same spot.
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