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The Pont du Gard is a three-level stone aqueduct crossing the Gardon river valley, about 25 km west of Avignon. Built over 2000 years ago, in 19 BC, by Marcus Vipsanius Agrippa, the son-in-law of Augustus.
The Pont du Gard was added to UNESCO's list of UNESCO World Heritage Sites in 1985.
Designed to carry the water across the small Gardon river valley, it was part of a nearly 50 km (31 mi) aqueduct that brought water from springs near Uzès to the Roman city of Nemausus (Nîmes). The full aqueduct had a gradient of 34 cm/km (1/3000), descending only 17 m vertically in its entire length and delivering 20,000 cubic meters (44 million gallons) of water daily.
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