Werdersch (German: Mundart der Weichselwerder) is a subdialect of Low Prussian, which itself is a subdialect of Low German. This dialect is spoken in Poland and was spoken in the former province of West Prussia. The Weichselwerder (Vistula river islands) were Żuławy Gdańskie between Wisła Gdańska and Gdańskie Wyżyny and Żuławy Malborskie between Vistula, Szkarpawa, Vistula Lagoon, and Nogat.