Tarn (river) a mean flow of approximately . The Millau Viaduct spans the valley of the Tarn near Millau, and is now one of the area's most popular attractions. The tributaries of the Tarn include: The Tarn separates the Narbonne and Aquitaine basins. The Tarn passes through the following departments and towns: The Millau Viaduct, the tallest bridge in the world, carrying the A75 autoroute across the Tarn Gorge near Millau, opened in December 2004. The Tarn is famous for its brutal floodings, which are the most dangerous in Europe along with the Danube. The flooding of March 1930 saw the Tarn
Millau had one of the major mediaeval bridges across the river Tarn. It had 17 spans, but after one poorly maintained span fell in the 18th century, the bridge was mostly demolished. Just one span remains, with a mill that is now an art gallery, as testament to this significant trading route from north to south across pre-Renaissance France. In 1999, José Bové, a local Larzac anti-globalisation activist demolished the Millau McDonald's as it was being built, in symbolic protest of the decision by the Court of the World Trade Organization to allow the United States to overtax the import of