No, the towpath starts at Quiheix lock no. 2 in the commune of Nort-sur-Erdre and runs through to the last lock at Guily-Glaz in Port-Launay, but not as far as Brest. Note that the towpath is cut at Guerlédan dam and you will have to skirt around the lake. See also the pages on the Nantes to Brest canal.