Eisack-Isarco

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The Eisack (Italian: Isarco, German: Eisack) is a river in Northern Italy, the second largest river in the Trentino-South Tyrol region. Its source is near the Brenner Pass, at an altitude of about 1990 m above sea level. After about 96 km, it meets the Adige river south of Bolzano. The Eisack draws water from an area of about 4,200 km².

The more important towns and villages along the course of the river are Sterzing, Franzensfeste, Brixen, Klausen, Waidbruck and the capital city Bolzano. Several smaller creeks flow into the Eisack, including the Ridnauner Bach, the Pflerscher Bach, the Pfitscher Bach, Rienz, the Villnösser Bach, the Grödner Bach, the Braibach (also known as Tierser Bach), the Eggentaler Bach and the Talfer flowing from the Sarntal.

The Eisack is used extensively for the production of electricity and is dammed near Franzensfeste, Klausen and Waidbruck.