The Canal du Midi together with the Canal de Garonne (the renamed Canal lateral a la Garonne), forms the ‘canal des deux mers’ (the canal of the two seas – the Mediterranean and the Atlantic).
Canal du Midi : Cruising in Detail | french-waterways.com
It looks possible to cruise from Bordeaux to the Mediterranean in a shallow draft yacht - perhaps 1.2m draft?
Anyone cruised this waterway. Be good to hear experiences