The Ungeheuersee in the Palatinate Forest of Germany is a raised bog pond surrounded by mixed forest, which is located about three kilometres west-southwest of the village of Weisenheim am Berg. Because the lake is part of the only raised bog in the Palatinate Forest and is important for the species-rich flora along its shore and on its floating island (including cotton grasses and orchids), it was placed under protection in the 1930s as a natural monument.