The Canal du Midi has some stunning locations and great fishing along its length and there are areas where you can night fish for carp like Castelnaudary. The Canel is 241 Km long (150 miles) and work started on the building of it in the 17th C. It runs from Toulouse in to the area passing Carcassonne and winding its way to the sea at Sete.
As with all French water rules can change at any time so please check on site or local tackle shop for latest rules.
Please note – When fishing any Public waters in France please have respect for the location and clear up any mess that you have made and do not damage banks / vegetation and no open fires, Catch and release all fish except Trout and Salmon that rules let you take and when fishing for Carp use appropriate fishing tackle with large landing net and unhooking mat. Fish stealing is a big problem from Public waters if you see anybody removing large fish like Carp please take note of the vehicle registration and report to authorities.