The Canal du Midi is located in the south of France, in the departments of Hérault, Aude, and Haute-Garonne.Its course runs for 240 kilometres between Marseillan, at a place called Les Onglous, where the canal opens into the étang de Thau near Sète and Toulouse at Port de l'Embouchure.. The Canal du Midi is a summit-level canal, climbing from Toulouse on the Atlantic side over a distance of ...