The Canal des Deux Mers à Vélo links the Atlantic to the Mediterranean by following two historic canals end to end: the Canal latéral à la Garonne and the Canal du Midi, a UNESCO World Heritage site. Over 490 km, the route crosses southwest France from west to east, staying by the water almost the entire way.
Two canals, one crossing
From Bordeaux to Toulouse, the route follows the Canal latéral à la Garonne, completed in the mid-19th century to provide a more reliable waterway link than the notoriously temperamental Garonne itself. From Toulouse to Sète, it joins the Canal du Midi, a 17th-century hydraulic engineering masterpiece envisioned by Pierre-Paul Riquet to link the two seas without sailing around Spain via the Strait of Gibraltar.
The towpath, generally flat and shaded for much of the way by a century-old avenue of plane trees (currently being replanted following a disease that affected some of the historic trees), crosses a rural southwest France shaped by bastide towns, vineyards and cassoulet.
No need to do it all at once
Each stage ends in a town well served by train (Bordeaux, Toulouse, Carcassonne, Sète), making it easy to join or leave the route at will. For a first taste without committing to several days, the Carcassonne-Trèbes-Marseillette loop (covered separately on the site) gives an excellent sense of the Canal du Midi’s atmosphere in a single day.
How to approach the ride as a family
The generally flat terrain makes this an accessible route for a wide audience, including families. Only the crossing of the Seuil de Naurouze, the watershed point between the two canals near Castelnaudary, brings a slight rise — the only real climb on the whole route.
When to go
The ideal window runs from April to October. Summer can get hot in southwest France, especially on the Mediterranean stretch near Béziers and Sète; the generous shade from the plane trees remains a real advantage over more exposed routes.
Good to know
Toulouse, roughly at the halfway point, makes an excellent handover point for splitting the route into two separate trips: the more rural Atlantic stretch (Bordeaux-Toulouse), and the more heritage-rich Mediterranean stretch (Toulouse-Sète) with Carcassonne and its UNESCO-listed Canal du Midi.
