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A masterpiece still in operation, these 9 locks that follow one another, you should not hesitate to visit this place. In excellent condition and very well laid out, you can follow the paths along the canal and arrive near the very beautiful and old bridge.
From Toulouse, the Canal du Midi reaches Béziers via a 54-kilometer-long reach (a section of canal without locks). Over this distance, the canal remains at an altitude of 31.54 meters. But at Fonseranes, the canal must descend a steep 25-meter drop to reach the Orb, a necessary passage for boats heading to Agde.
To establish the connection between the canal and the Orb, an extraordinary lock was built. Thanks to a successful initial experiment in Castelnaudary, Riquet knew that the secret lay in a lock with multiple chambers.
Faced with the significant difference in altitude, Riquet and his works director decided to add eight chambers, twice as many as those of the Saint-Roch lock in Castelnaudary !  Work on the Fonseranes lock began in 1667 and was completed in 1680.
The structure is impressive! At 315 meters long and with a total drop of 21.18 meters, this lock ladder is the largest ever built in France ...