This is not about the canal Saint-Martin in Paris, but in Rennes and Brittany. It flows through the North of Rennes, has its own quarter, which seams to be of so little relevance to the rest of the world, that its Wikipedia site exists only in French. This is probably a good way to hide the quarter and keep its charm.
I just walked along the canal on an evening in late summer and the canal is just lovely. It is frequented by walkers, joggers and bikers – the city’s outdoor gym. It is very quiet and peaceful, and yet not far from the city center.
Enjoy your virtual walk along the canal Saint-Martin.