There are quite a few canals like this one in Hamburg. Some are open to the river and some are protected from the tide by lock gates. The water is clean - there are strict pollution laws here.
My thanks to all who leave comments for my work and to those of you who like one enough to make it a favourite. To touch just one person that way makes each image worthwhile. . . . . . . . . .. . . . "The question is not what you look at, but what you see" ~ Marcel Proust