
Unterwalden (Latinized as Sylvania, later also Subsylvania as opposed to Supersylvania) is the old name of a forest-canton of the Old Swiss Confederacy in central Switzerland, south of Lake Lucerne, consisting of two valleys or Talschaften, now organized as two half-cantons, an upper part, Obwalden, and a lower part, Nidwalden. Unterwalden was one...
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http://en.wikipedia.org/wiki/Unterwalden

former canton, central Switzerland; it occupied the basins of the Sarner Aa (river) and the Engelberger Aa. The former canton is divided (east and ... [3 related articles]
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http://www.britannica.com/eb/a-z/u/14

a canton in central Switzerland: divided into demicantons. Cf.
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https://www.infoplease.com/dictionary/unterwalden
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