The Ziller (German pronunciation: [ˈt͡sɪlɐ] ⓘ) is a right tributary to the Inn, in the Zillertal in Tyrol, Austria.

[1] It springs from the ridge of the Zillertal Alps, and feeds the Zillergründl Dam.

By Zell am Ziller, it receives the Gerlosbach, before flowing into the Inn by Strass im Zillertal.

For historical reasons, the Ziller—first mentioned in 927 as Zilare[2]—for most of its course makes up the border between the Diocese of Innsbruck on the west and the Archdiocese of Salzburg on the east.

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