From the Wikipedia page [1]
Wesermarsch is a Kreis (district) in the northwestern part of Lower Saxony, Germany. Neighboring are (from the east clockwise) the districts of Cuxhaven and Osterholz, the city of Bremen in the state Free Hanseatic City of Bremen, the urban district of Delmenhorst, the district of Oldenburg and the urban district of Oldenburg, and the districts of Ammerland and Friesland.
The district was created in 1933 by merging the Ämter of Butjadingen, Brake and Elsfleth, and parts of the Ämter of Delmenhorst and Varel