Forggensee

thumb|The Forggensee from the north. In the background are the Tegelberg, [[Säuling, Thaneller and Tannheim Mountains, Neuschwanstein Castle may be seen in the foothills to the left; to the right is Füssen]] The Forggensee, also called the Roßhaupten Reservoir, is a reservoir located north of Füssen in the county of Ostallgäu in Bavaria, Germany and one of many lakes in the region around Hohenschwangau and Neuschwanstein castles. With a surface area of 15.2 km2, it is the fifth-largest lake in Bavaria and the largest reservoir in Germany by area. The River Lech flows through it. The Forggensee is known primarily as a tourist destination for aquatic sports and recreation. Besides Füssen, other settlements on the lake include Halblech, Rieden am Forggensee and Roßhaupten. The lake takes its name from the former hamlet of Forggen which has been submerged by the reservoir.

== Origin == Following the climax of the last ice age, the Lech-Wertach foreland glacier, which covered the entire Ostallgäu, gradually melted back from its maximum extent at Kaufbeuren. In the course of its retreat, as in the entire Pre-Alpine area, new morainic ridges were formed from the masses of debris carried by the ice from the mountains piled up at the edge of the glacial tongue whenever the glacier halted temporarily or advanced briefly again. These ridges can still be seen in today's landscape.