At last, something in English about this canal! Living in Brittany I know my local section of the canal quite well but hadn't realised just how extensive it is until studying this guide - 365kms! The introduction gives the canal's history from the start of building in Napoleonic times to the present day and then the book consists of maps of the entire towpath, with details of places to stay and eat and get supplies. There are many interesting 'canal facts' on these pages - did you know the Nantes-Brest is twinned with the Wilts-Berks canal in England, for example? Or that the towpath does not extend to either Nantes or Brest? The presentation of information is excellent, with lots of colour photos showing the variety of the scenery and places to visit nearby, but also some old black and white pictures of the canal in earlier times.
I really like the spiral binding, which makes carrying and consulting the book easy when walking. For planning a long walk this guide looks essential, but it will be equally useful just for days out and visiting interesting things along the route.