Splügen (Romansh: Spleia, Italian: Spluga) is a former municipality in the Viamala Region in the Swiss canton of Graubünden.

Of the rest of the land, 1% is settled (buildings or roads) and the remainder (42.9%) is non-productive (rivers, glaciers or mountains).

[4] Before 2017, the municipality was located in the Rheinwald sub-district, of the Hinterrhein district, after 2017 it was part of the Viamala Region.

The pass is closed in winter nowadays and the whole route hosts a number of historically interesting spots that can be reached on a common multiday hike between Thusis and Chiavenna,[6] passing the two gorges Roflaschlucht and Viamala north of Splügen.

The former Säumerherberge (mule drivers hostel) Weiss Kreuz is listed as a Swiss heritage sites of national significance.

The prize description notes that Splügen had reached a notable compromise between preservation and tourism.

The old town was strictly protected to maintain the original appearance, while rational zone planning allowed development to occur outside the old village.