The Malpas tunnel
The Malpas Tunnel is a perfect example of the obstinacy of Pierre-Paul Riquet, the engineer who designed and built the Canal du Midi. At the time, the Ensérune hill in the Hérault region posed a problem for the canal route. The soil was very crumbly, and any construction risked collapsing. It was therefore decided to dig the 173-meter-long canal-tunnel, which features 30 arches to support its structure. Crossing it by boat is always a highlight for yachtsmen. You can also stroll along the towpath, which also passes beneath the tunnel.