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, spanning the two countries.

The aqueduct was designed by civil engineer Thomas Telford[1] for the Ellesmere Canal.

[3] The aqueduct was briefly the tallest navigable one ever built, and it now is Grade II* listed in both England and Wales.

[4][5] It forms part of the Pontcysyllte Aqueduct World Heritage Site.

[5] Chirk Railway Viaduct was built later alongside the aqueduct.