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 to Amiliavum, then to Milhau en Rouergat (in the Millhau language), then to the French Millhau. By the ninth century the town has grown and is the seat of a viguerie, a mediaeval administrative court, and a centre for the production of lambskin gloves. At this time the town is surrounded by ramparts. The tenth and eleventh centuries saw the creation of the Viscount of Millau and subsequently passed to the Counts of Provence, the Counts of Barcelona and eventually, in 1112, to the father of the future King of Aragon, Béranger III following his marriage to the daughter of