Llangollen Canal has 19 stone arches, each with a 45-foot (14 metre) span. Another aqueduct carries the canal over the River Ceiriog at Chirk, and there are tunnels nearby at Whitehouses, Chirk, and Ellesmere. The canal also forms the boundary on two sides of the Fenn's, Whixall and Bettisfield Mosses National Nature Reserve. In 2009 an eleven-mile section of the canal from Gledrid Bridge near Rhoswiel through to the Horseshoe Falls, which includes Chirk Aqueduct and Pontcysyllte Aqueduct, was declared a World Heritage site by UNESCO. The canal at Hurleston Junction rises from the Shropshire Union Canal main line, through four adjacent
Prees Branch Canal Nature Reserve Canal (now the Llangollen Canal) to Prees, but was only constructed as far as Quina Brook. It is only navigable as far as a marina, beyond which the reserve is effectively a long pond and its banks. Prees Branch Canal Nature Reserve Prees Branch Canal Nature Reserve is a Shropshire Wildlife Trust nature reserve in the civil parish of Whixall, Shropshire, England. It is a Site of Special Scientific Interest due to the presence of rare pondweeds (Potamogeton), and also is the home of watervoles. Dragonflies and other invertebrates occur in the water, on the banks and in the air