The width on the surface is 20 m on average with variations between 16 m and 20 m. Finally, the width of the bottom of the canal is 10 m.The graph shows the profile of the Canal du Midi from Toulouse (1), through the Seuil de Naurouze (2), Castelnaudary (3), then Carcassonne (4), and Trèbes (5). ###>La largeur au miroir (surface du canal) varie entre et .