Eisack
river in Northern Italy
The Eisack (German: Eisack, pronounced [ˈaɪzak] ; Italian: Isarco [iˈzarko]; Latin: Isarus or Isarcus) is a river in Northern Italy, the second largest river in South Tyrol. Its source is near the Brenner Pass, at an altitude of about 1990 m above sea level. The river draws water from an area of about 4,200 km2. After about 96 km, it joins the Adige river south of Bolzano. At first the river flows through the Wipptal and after the village of Vahrn through the Eisacktal. Its source is sung of in the Bozner Bergsteigerlied as the northern frontier of the South Tyrolean homeland.
The major towns and villages along the course of the river are Sterzing, Franzensfeste, Brixen, Klausen, Waidbruck and finally the capital city of the province. In Brixen it merges with the Rienz. Several smaller creeks are tributaries, including the Ridnauner Bach, the Pflerscher Bach, the Pfitscher Bach, the Villnößer Bach, the Derjon, the Braibach (also known as Tierser Bach), the Eggentaler Bach and the Talfer flowing from Sarntal.
The Eisack is used extensively for the production of electricity; it is dammed near Franzensfeste, Klausen and Waidbruck.
“Eisack” enters the record as river in Northern Italy. Crown Archives preserves that source wording while asking what Eisack, river and Northern can confirm, complicate or overturn.
Why this record matters
“Eisack” is worth following because a concise public description often conceals a longer documentary argument. Here, Eisack, river and Northern provides the most credible route into that argument.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Sep 12, 2026. The linked authority identifier is Q596901. VIAF identifies the subject as 2875148574388724430001. The Library of Congress control number is sh85068333. Authority coordinates are 46.441, 11.315. 1 of 3 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1990.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
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Three-step research path
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Questions for further research
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This entry incorporates text from “Eisack” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.