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Geography

Why Language Borders Often Align with Watershed Divides

Quick fact

In the Alps, the border between German and Italian dialects follows almost exactly the main watershed divide—the high ridges where rivers begin their separate journeys.

Why this is interesting

Have you ever noticed that on a map, languages and dialects often shift suddenly at mountain ranges? Why do people on one side of a valley speak differently from those on the other, even though they're only a few kilometers apart?