In German dialectology, the Speyer line or Main line (Main River) is an isogloss separating the Central German dialects to the north, which have a stop in words like Appel "apple", from the Upper German dialects to the south, which have an affricate, Apfel. The Speyer line begins in Alsace near Strasbourg, and runs northeast to Thüringen, crossing the Rhine at Speyer.
In German dialectology, the Speyer line or Main line (Main River) is an isogloss separating the Central German dialects to the north, which have a stop in words like Appel "apple", from the Upper German dialects to the south, which have an affricate, Apfel. The Speyer line begins in Alsace near Strasbourg, and runs northeast to Thüringen, crossing the Rhine at Speyer.
Source: Wikipedia "Speyer line" · CC BY-SA 4.0
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