Canal companies would generally own the land that the canal was built on plus the towpath, but where their land ended isn’t always obvious. On the towpath side of the canal there would usually be a hedge or wall, but on the offside the boundary might be the water’s edge – or there might be a strip of land owned by the company. And on rivers, they might not own either bank. Some companies, therefore, made a point of marking their boundary with small metal boundary posts. They were a particular feature of the Birmingham Canal Navigations but can also be seen elsewhere: they can be found on the Montgomery (which was part of the Shropshire Union system) and our picture shows a surprisingly recent British Waterways Board one on the Calder & Hebble Navigation.