Llantysilio
The distinctively shaped weir, which is 460 feet (140 m) long, helps create a pool of water that can enter the Llangollen Canal via an adjacent valve house and flow meter. Since 2009, the weir has been part of a World Heritage Site, which covers 11 miles (18 km) of the Llangollen Canal from just west of Horseshoe Falls to just beyond Chirk Aqueduct. The canal was awarded World Heritage status because of the bold civil engineering solutions needed to construct a canal with no locks through such difficult terrain.
Thanks to all Phoide contributors to Llantysilio!
Most notably Alan Taylor.