The Gran Valira (ˈgɾam bəˈɫiɾə, ˈgɾam baˈliɾa) is the biggest river in Andorra

Andorra

Andorra , officially the Principality of Andorra , also called the Principality of the Valleys of Andorra, , is a small landlocked country in southwestern Europe, located in the eastern Pyrenees mountains and bordered by Spain and France. It is the sixth smallest nation in Europe having an area of...

. It flows through the capital, Andorra la Vella

Andorra la Vella

Andorra la Vella is the capital of the Co-principality of Andorra, and is located high in the east Pyrenees between France and Spain. It is also the name of the parish that surrounds the capital....

, and exits the country in the south near the Spain-Andorra road border crossing.

The Valira is a tributary to the Segre, which in turn is a tributary to the Ebro

Ebro

The Ebro or Ebre is one of the most important rivers in the Iberian Peninsula. It is the biggest river by discharge volume in Spain.The Ebro flows through the following cities:*Reinosa in Cantabria.*Miranda de Ebro in Castile and León....

. It flows into the Segre in La Seu d'Urgell

La Seu d'Urgell

La Seu d'Urgell is a town located in the Catalan Pyrenees in Spain. La Seu d'Urgell is also the capital of the comarca Alt Urgell, head of the judicial district of la Seu d'Urgell and the seat of Bishop of Urgell, one of the Andorra co-princes...

. Its main tributaries are the Valira d'Orient, the Valira del Nord and the Madriu. The Valira river system is 35 km long.