The Malpas tunnel was excavated in 1679 under the hill d'Ensérune in Hérault, allowing the passage of the Canal du Midi. It was Europe's first navigable canal tunnel and a monument to the determination of Pierre-Paul Riquet, the chief engineer. It is located in the commune of Nissan-lez-Ensérune. The Oppidum d'Ensérune is located on the surface a short distance from the tunnel.
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