List_of_rivers_of_Catalonia
The rivers of Catalonia can be classified into four groups according to their source.
- Rivers of the Ebre basin, which can be further divided into:
- the lower basin of the Ebre itself, which corresponds with the comarques of Ribera d'Ebre, Terra Alta, Baix Ebre and Montsià.
- the basin of the Segre and its affluents, which roughly corresponds, in Catalonia, with the province of Lleida: the basin of the Segre also covers much of Aragon.
- Rivers of the eastern Pyrenees: Muga, Fluvià, Ter, roughly corresponding with the province of Girona
- Rivers of the Pre-Coastal Range: Tordera, Besòs, Foix, Gaià, Francolí
- Rivers of the Coastal Range: these are very short and of only local importance
The Llobregat deserves a special mention because of its importance: its basin covers most of the province of Barcelona. It source is in the Pyrenean Serra del Cadí in the municipality of Castellar de n'Hug (Berguedà) and its valley is one of the main north–south communication routes in Catalonia.
The Aran Valley is the upper valley of the Garonne (la Garona in Catalan, era Garona in Aranese), an Atlantic river which meets the sea near Bordeaux, France. The boundaries of the comarca do not correspond exactly with the watershed, and both the Noguera Ribagorçana and the Noguera Pallaresa have their sources on its territory.
The frontier between Catalonia and the Valencian Community is formed for much of its length by the Sénia, while the Noguera Ribagorçana forms the frontier with Aragon for much of its northern half.