German-speaking Switzerland

The German-speaking part of Switzerland (German: Deutschschweiz, French: Suisse alémanique, Italian: Svizzera tedesca, Romansh: Svizra tudestga) comprises about 65 percent of Switzerland (North Western Switzerland, Eastern Switzerland, Central Switzerland, most of the Swiss plateau and the greater part of the Swiss Alps).

The variety of the German language spoken in Switzerland is called Swiss German which refers to any of the Alemannic dialects and which are divided into Low, High and Highest Alemannic. The only exception within German-speaking Switzerland is the municipality of Samnaun where an Austro-Bavarian dialect is spoken.

In 17 Swiss cantons, German is the only official language (Aargau, Appenzell Ausserrhoden, Appenzell Innerrhoden, Basel-Stadt, Basel-Landschaft, Glarus, Lucerne, Nidwalden, Obwalden, Schaffhausen, Schwyz, Solothurn, St. Gallen, Thurgau, Uri, Zug, Zurich).

...
Wikipedia