Pontcysyllte Aqueduct and River in Wales Aerial View

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The Pontcysyllte Aqueduct is a navigable aqueduct that carries the Llangollen Canal across the River Dee in Wales. 18 arched stone and cast iron structure, is now the oldest and longest navigable aqueduct in Great Britain and the highest in the world. Narrowboats and barges still use it for commercial and pleasure