Bad Zwischenahn is a town and a municipality in the low-lying Ammerland district, in Lower Saxony, Germany. It is on Zwischenahner Meer, approximately 15 km northwest of Oldenburg and about 70 km south of the North Sea coast.
Wikipedia https://en.wikipedia.org/wiki/Bad_Zwischenahn
Official Website https://www.bad-zwischenahn.de/de/index.php
Coordinates 53°11'6.558" N 8°0'12.556" E