The map was surveyed and published between 1888 and 1893. It's just a fragment from a map of the whole of Lancashire. This particular image is a composite made with three screenshots, carefully arranged to ensure that the joins are as invisible as possible
Nonetheless, there are some interesting features, I wonder whether you'll notice more than me.
You can either comment using the text box at the bottom of the story or try the 'Blog Chat' link in the righthand column, I've set up a 'WhatsApp group' as an experiment.
Tell me what you find and any other observation you want to add.
I hope you enjoy this puzzle to start the week.