Analysis of information sources in references of the Wikipedia article "Ebro" in English language version.
Situated in a single drainage basin, Andorra's main stream, the Riu Valira (also known as Balira), only about 52 km long, has two distinct branches. One of these, the Valira del Norte (24 km), and its principal tributary, the Arinsal River, drain western Andorra. The Valira del Orien (28 km) drains the eastern part and has a tributary, the Madriu. The two branches unite in southwest Andorra to form the Gran Valira which leaves the country to join the Segre River 11 km south of the border in northeastern Spain. The Segre is a tributary of the Ebro; thus, all of Andorra's drainage is Mediterranean.
Situated in a single drainage basin, Andorra's main stream, the Riu Valira (also known as Balira), only about 52 km long, has two distinct branches. One of these, the Valira del Norte (24 km), and its principal tributary, the Arinsal River, drain western Andorra. The Valira del Orien (28 km) drains the eastern part and has a tributary, the Madriu. The two branches unite in southwest Andorra to form the Gran Valira which leaves the country to join the Segre River 11 km south of the border in northeastern Spain. The Segre is a tributary of the Ebro; thus, all of Andorra's drainage is Mediterranean.
