Tarn, river, c.235 mi (380 km) long, rising in the Cévennes Mts., S France, and flowing southwest before emptying into the Garonne River. Deep gorges and canyons formed by the river are tourist attractions. Near Millau the Tarn gorge is crossed by the cable-stayed, multispan Millau Viaduct (2004), one of the world's highest road bridges.
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