On this map for Staffordshire and surrounds you can get a few results by typing 'canal' into the search box.
But it isn't at all comprehensive. It becomes quite hard to be objective about what is accessible, depending very much on time, fitness, and enthusiasm for a venue!
https://www.google.com/maps/d/viewer?...mid=1rYM8KCgNpRZWIBHWB0fQQtshLzs
Open it in a browser not 'maps'.