The Pont du Gard carries an aqueduct on three tiers of arches

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The bridge over the Gardon is built in three superimposed arcades to carry the Nimes aqueduct across the valley. It demonstrates the arch used as infrastructure rather than ornament: each arch in an arcade pushes against its neighbour, so only the end piers need heavy abutment, and the whole tiered structure is dry-laid cut stone with the channel on top falling at a very shallow gradient.

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