Pontcysyllte Aqueduct is a UNESCO World Heritage site located in Wrexham County Borough, North Wales, United Kingdom. It was built in the late 18th century as part of the Llangollen Canal, which was designed to transport goods from the coal mines in the northeast to the markets of England.

The aqueduct spans the River Dee and the Dee Valley, and is a masterpiece of engineering, considered to be one of the finest examples of canal engineering in the world. It is a cast-iron trough, supported on stone pillars, that carries the canal 126 feet (38 meters) above the river. The structure is 1,007 feet (307 meters) long, 11 feet (3.4 meters) wide, and has a maximum depth of 5 feet 3 inches (1.6 meters).

The aqueduct was designed and built by Thomas Telford and William Jessop, and was completed in 1805. At the time of its construction, it was the largest and highest aqueduct in the world. Today, it is still in use and visitors can take a canal boat ride over the aqueduct, offering stunning views of the surrounding countryside.

In addition to the aqueduct, the surrounding area is also designated as a Site of Special Scientific Interest due to its diverse plant and animal life. The Pontcysyllte Aqueduct and Canal is a popular tourist destination and attracts visitors from all over the world.