Chirk Aqueduct is a 70-foot (21 m) high and 710-foot (220 m) long navigable aqueduct that carries what is now the Llangollen Canal across the Ceiriog Valley near Chirk, on the England-Wales border.The aqueduct was designed by Thomas Telford for the Ellesmere Canal and completed in 1801. It possesses a cast iron trough within which the water is contained. The masonry walls effectively hide the cast iron interior. The aqueduct consists of ten arches, each with a span of 40 feet (12 m). The water level is 65 feet (20 m) above the ground and 70 feet (21 m) above the River Ceiriog. The first stone was laid on 17 June 1796.William Hazledine provided the ironwork for the aqueduct. Side plates were added to the aqueduct in 1870.