"7.3"^^ . "13.0"^^ . . "1734.0"^^ . "500000.0"^^ . "5-6 months" . "Obersee (\"upper lake\") or Oberer Arosasee is the lake in the center of Arosa, a resort in the Grisons, Switzerland. The lake has a surface area of 7.1 ha (18 acres) at an elevation of 1734 m. Arosa's lower lake (Untersee) is at 1691 m."@en . . "390.0"^^ . "Obersee"@en . . . "250.0"^^ . . . "71000.0"^^ . . .