A Zungenbecken (German pronunciation: [ˈtsʊŋənˌbɛkn̩]), also called a tongue basin[1] or tongue-basin,[2] is part of a succession of ice age geological landforms, known as a glacial series.
It is a hollow that is left behind by the ice mass, as the snout of the glacier (German: Gletscherzunge, lit.
When the glacier has more fully retreated this produces a finger lake or glacial piedmont lake (German: Zungenbeckensee, known as a Gletscherendsee of the glacial series in the Alpine Foreland).
The term Zungenbecken is of German origin, but used in English language sources.
[3][4][5] Examples are the Tegernsee, Ammersee, Starnberger See, Lake Constance, Chiemsee, Tollensesee and the Baltic Sea.