Canal du Midi, France
Also known as the "Pink City," Toulouse is the fourth largest city in France. It is located on the banks of the River Garonne, 150 kilometres from the Mediterranean Sea, 230 km from the Atlantic Ocean and 680 km from Paris.
The Canal du Midi is a 240-km-long canal that connects Toulouse to the Mediterranean Sea via the Étang de Thau. It is one of the oldest European canals still in operation.
Construction lasted from 1666 to 1681, under the supervision of Pierre-Paul Riquet whose goal was to provide an inland water route. "The key challenge was to convey water from the Montagne Noire (Black Mountains) to the Seuil de Naurouze, the highest point of the canal." (Source: Wikipedia)
The Canal du Midi has 91 working locks that are still operated by keepers. It has been a UNESCO World Heritage Site since 1996.