Riegsee is a municipality in the district of Garmisch-Partenkirchen, in Bavaria, Germany. The town lies on Riegsee Lake, of the same name. The name Riegsee derives from the personal name Ruodgis and the Old High German word for "lake", sê. Attested historical forms of the name include Ruodgise, Rvodgisisse, Roueggese, Ruodkisesse/Rotkisesse, Ruetg…Riegsee is a municipality in the district of Garmisch-Partenkirchen, in Bavaria, Germany. The town lies on Riegsee Lake, of the same name. The name Riegsee derives from the personal name Ruodgis and the Old High German word for "lake", sê. Attested historical forms of the name include Ruodgise, Rvodgisisse, Roueggese, Ruodkisesse/Rotkisesse, Ruetgisse, Ruggessê, Roͮikisse, Rovchse, Rügsee, Rugksee, Ruexsee, Rügksee, Riechsee, and Riegsee.