Plautdietsch
Plautdietsch (pronounced [ˈplaʊt.ditʃ]) or Mennonite Low German is a Low Prussian dialect of East Low German with Dutch influence that developed in the 16th and 17th centuries in the Vistula delta area of Royal Prussia. The word Plautdietsch translates to "flat (or low) German" (referring to the plains of northern Germany).