Semmering zĕmˈərĭng [key], scenic resort region of the Eastern Alps, E Austria. The Alps there are crossed by the Semmering Pass, 3,215 ft (980 m) high and 275 ft (84 m) long. Beneath it runs the first mountain railroad in the world (built 1848–54). It passes through 15 tunnels and over 16 viaducts.

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