The Hérault is a river of southern France. Its length is 148 kilometres . Its source is on the slopes of Mont Aigoual in the Cévennes mountains. It reaches the Mediterranean Sea near Agde.
The lower reaches of the Hérault, from Bessan to the sea at Agde, are navigable. The lowest 2.5 kilometres are tidal, whilst the next 1 kilometre forms part of the Canal du Midi. These two sections of the river are linked to each other, and to the Canal du Midi to the west, by short junction canals and the famous Agde Round Lock.
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