Hopfensee is a lake in Bayerisch Schwaben, Bavaria, Germany. At an elevation of 783.8 m, its surface area is 194 ha.
The maximum length of the lake is 2.1 km, and its circumference is 6.8 km. It lies north of Füssen in Ostallgäu. Its maximum depth is 10 m. It was formed by the Lechtal glacier and is one of the remains of a larger Fuessener See. The Hopfensee-Ach flows out of the lake and into the Forggensee.
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