The variants of the name of the Rhine in modern languages are all derived from the Gaulish name Rēnos, which was adapted in Roman-era geography (1st century BC) as Greek Ῥῆνος (Rhēnos), Latin Rhenus.
The spelling with Rh- in

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The length of the Rhine is conventionally measured in "Rhine-kilometers" (Rheinkilometer), a scale introduced in 1939 which runs from the Old Rhine Bridge at Constance (0 km) to

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Alpine orogeny
The Rhine flows from the Alps to the North Sea Basin. The geography and geology of its present-day watershed has been developing since the Alpine orogeny began.
In southern Europe, the stage was set in the Triassic

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Antiquity
The Rhine was not known to Herodotus and first enters the historical period in the 1st century BC in

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Cities on the Rhine
Countries and borders
During its course from the Alps to the North Sea, the Rhine passes through four countries and constitutes

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• Central Commission for Navigation on the Rhine
• EV15 The Rhine Cycle Route
• Köln-Düsseldorfer

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• Rhinewith maps and details of navigation through the French section; places, ports and moorings, by the author of Inland Waterways of France, Imra

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