La Nouvelle Branch - Canal de La Robine

Following its opening in 1681, the commercial success of the Canal du Midi was such that Narbonne traders demanded improved access to it, so in 1686 the Canal de la Robine was constructed by Vauban as a lockless open cut following an abandoned course of the Aude. The northern end of the canal is at the Aude at Moussoulens just south of Sallèles-d'Aude from where goods were transported by land to the Canal du Midi at Le Somail — a journey of approximately 6 kilometres (3.7 mi). A century later, when the Canal de Jonction was constructed, the Canal de la Robine was straightened and six single locks were built to deal with the more severe gradients, Narbonne finally had direct waterway access to the Canal du Midi.

From the Aude the canal passes through the centre of Narbonne and under the Merchants' Bridge (fr: le pont des Marchands) which is one of the few bridges in France which is still lined with houses. From there it runs through Bages and the Ile Sainte Lucie nature reserve before meeting the Mediterranean at Port-la-Nouvelle.