Question

Gran Valira
Gran Valira flowing under the Pont de Paris in Andorra la Vella
Country	Andorra, Spain
City	Andorra la Vella
Tributaries
 - left	Valira d'Orient, Madriu
 - right	Valira del Nord
Source confluence	Valira d'Orient & Valira del Nord
 - location	Escaldes-Engordany, Andorra
 - coordinates	42°30′42″N 1°32′09″E / 42.5116°N 1.5357°E / 42.5116; 1.5357
Mouth
 - location	La Seu d'Urgell, Spain
 - coordinates	42°20′45″N 1°26′33″E / 42.3458°N 1.4425°E / 42.3458; 1.4425Coordinates: 42°20′45″N 1°26′33″E / 42.3458°N 1.4425°E / 42.3458; 1.4425
Length	35 km (22 mi)
Basin	592 km2 (229 sq mi)
Discharge
 - average	9.5 m3/s (335 cu ft/s)

The Gran Valira (Catalan pronunciation: [ˈɡran bəˈɫiɾə], locally: [ˈɡran baˈliɾa]) is the biggest river in Andorra. It flows through the capital, Andorra la Vella, and exits the country in the south near the Spain–Andorra road border crossing.

The Gran Valira is a tributary to the Segre, which in turn is a tributary to the Ebro. It flows into the Segre in La Seu d'Urgell. Its main tributaries are the Valira d'Orient, the Valira del Nord and the Madriu. The Valira river system is 35 kilometres (22 mi) long.

The map service of the Andorran government calls it the Gran Valira. In certain sources, especially those with a Spanish influence such as maps published in Spain, it is sometimes referred to as the Valira because in the territory of Spain there is only one Valira river. In Andorra, however, there are several different Valiras and hence there is a need to distinguish between them.

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Wikipedia