It is almost always true to say that where ever there are canals, there are pathways. The canals are a form of pathway themselves but in a more literal sense there are the waterside paths – the towpaths, originally built for the horses that provided the one horsepower required to pull the boats and their butties. As any traveller on the English narrow canals will know, there is still evidence of this means of propulsion. Many of the bridges have iron strips attached to the bottom of the arch on the towpath side; designed to protect the masonry, every example has multiple grooves worn into the metal by the ropes that once pulled the boats through the bridge holes.
This first picture was taken on the Canal du Midi at Colombiers one hot memorable summer when the shade of the tree lined waterway provided relief from a high bright summer sun; the second is a less warm, foggy morning on the Grand Union at Braunston:
(click on the images to enlarge)