"The Pont du Gard is an ancient Roman aqueduct that crosses the Gardon River near the town of Vers-Pont-du-Gard in southern France. The Pont du Gard is the highest of all elevated Roman aqueducts, and, along with the Aqueduct of Segovia, one of the best preserved. It was added to UNESCO's list of World Heritage Sites in 1985 because of its historical importance.
The bridge has three tiers of arches, stands 48.8 m high, and descends a mere 2.5 centimetres – a gradient of only 1 in 18,241 – while the whole aqueduct descends in height by only 12.6 m over its entire length."
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