Colbert quickly realized the importance of the proposed canal in this connection, and he gave his full support to Riquet's project. A Royal Edict announcing the construction of the canal was issued in October 1666 and letters-patent were granted to Riquet; however, this authorized him to construct only the western section, between the Garonne at Toulouse and the Aude at Trèbes. He was authorized to construct the second section, between Trèbes and Sète on the Mediterranean coast, in 1669.
The project underwent many vicissitudes and financial crises in the years that followed, but it was largely completed when Riquet died in 1681. Following persistent complaints about the flooding of neighbouring agricultural land, the great military architect Vauban was sent to the Canal; as a result of his report a number of aqueducts were built and the Saint-Ferréol dam was raised in height. The final elements of the entire system were completed in 1694.
There are five components of this property, and the total length of the waterway is 360 km. The main Canal du Midi runs from Toulouse to the Étang de Thau on the Mediterranean coast at Marseillan; there is a branch between Moussan and Port-la-Nouvelle, incorporating part of the earlier Canal de la Robine.
The waters of the Montagne-Noire are brought to the canal through two channels that join together and flow into the Canal at Naurouze. The canal de Saint-Pierre is the link between the main canal and the Garonne at Toulouse. Finally, there is a short section joining the Hérault River to the round lock at Agde. The ensemble contains 328 works of art - locks, aqueducts, bridges, spillways, tunnels, etc.
One of its most noteworthy features is the Saint-Ferréol dam on the Laudot River in the Montagne-Noire region. This is the largest project on the entire canal and the greatest work of civil engineering of its time, Riquet was conscious that he was creating a symbol of the power of 17th-century France as well as a functional communication waterway. He was assiduous, therefore, in ensuring that the quality of the architecture on the Canal was worthy of this role.
The bridges, the locks and their associated structures, and the tunnel entrances were therefore designed with monumental dignity and simplicity. He was also very conscious of the impact of his work on the landscape, and took great pains to ensure that it was suitably framed by trees and plantations that harmonized with the landscape through which it passed.
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