Highest Alemannic dialects are spoken in alpine regions of Switzerland: the Bernese Oberland, in the German-speaking parts of the Canton of Fribourg and Valais, and in the Walser settlements (mostly in Switzerland, but also in Italy and in Austria; see Walser German).

In the West, the South and the South-East, they are surrounded by Romance languages; in the North, by High Alemannic dialects.

In the Swiss canton of Graubünden (Grisons) only the Walser exclaves in the Romansh part and the Prättigau, Schanfigg and Davos are Highest Alemannic; the Rhine Valley with Chur and Engadin are High Alemannic.

The distinctive feature of the Highest Alemannic dialects is the lack of hiatus diphthongization, for instance [ˈʃniː.ə(n)] 'to snow', [ˈb̥uː.ə(n)] 'to build' vs. High Alemannic [ˈʃnei̯jə], [ˈb̥ou̯wə].

The dialect of the Lötschental, for instance, preserved the three distinct classes of weak verbs (as in Old High German) until the beginning of the 20th century.