Segre is a river tributary to the Ebre.
It starts at the Spanish exclave of Llívia, passes through La Seu d'Urgell, Balaguer, Lleida and joins into the Ebre at Mequinenza.
Among its tributaries: Valira, Noguera Pallaresa, Noguera Ribargorzana, Cinca.
See also: Pyrenees
