The Inn is a river in Switzerland, Austria and Germany. It is a right tributary of the Danube and is 517 kilometres long. The highest point of its drainage basin is the summit of Piz Bernina, at 4,049 metres . The Engadine, the valley of the En, is the only Swiss valley from which its waters ends in the Black Sea .
The name Inn is derived from the old Celtic words en and enios, which means water in English. In a document of 1338, the river is named Wasser . The first written mention from the years 105 to 109 reads: "... Sextilius Felix... ad occupandam ripam Aeni fluminis, quod Raetos Noricosque interfluit, missus..." or: "... Sextilius Felix was sent to capture the banks of the river Inn, which flows between the Rhaetian people and the Noric people." The river is also mentioned by other authors of the Roman Empire as Ainos or Aenus . In medieval Latin it is mostly written as Enus, by the humanists Oenus. The change in the old Bavarian language from e to i turns Enus to In. Until the 17th century, it is written like this or Yn, but also Ihn or Yhn. The double-n appears only in the 16th century, for example in the Tyrolian Landreim of 1557, and since the 18th century this spelling and pronunciation with a short vowel has been customary.
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