I cycled close to this on a touring bike a few years ago. It's a nice area. Lots of sunflowers! Wine too, obviously. Also, the canal seems to be perfect midge breeding ground, so lots of deet wouldn't go amiss! (They do bite)
Would have thought it was less from Bordeaux to the Med, I did it in about three / four (a very leisurely pace)… It's quite fast given it's all flat 🙂
We cycled along the canal on our roady bikes for a while, but got off it as it was faster and less midgey on the nearby roads.
It'd be a lovely trip, do it!