Uerdingen line

The Uerdingen Line (German: Ürdinger Linie, Uerdinger Linie, Dutch: Uerdinger linie; named after Uerdingen by Georg Wenker) is the isogloss within West Germanic languages that separates dialects which preserve the -k sound in the first person singular pronoun word "ik" (north of the line) from dialects in which the word-final -k has changed to word final -ch in the word "ich" (IPA [ç]) (south of the line).

Especially in eastern Germany, the regional languages have been largely replaced by standard German since the 20th century.

The western end of the Uerdingen line is at Bierbeek, southwest of Leuven, Flemish Brabant, Belgium.

From there, it runs in northeastern direction, north of Hasselt and Weert, Netherlands, from where it goes straight east.

In southern Brandenburg in eastern Germany, the isogloss runs by Halbe, Hermsdorf, Freidorf and Staakow.