The Neath and Tennant Canals were two independent but linked canals in South Wales that are usually regarded as a single canal. They are the subject of considerable restoration work. They meet at Aberdulais basin. Glan-y-wern Canal The Glan-y-wern Canal is a branch of the Tennant Canal which branches northwards near Crymlyn Burrows. It terminates at the Crymlyn Bog nature reserve.