Gelmersee (or Lake Gelmer) is a lake in Bernese Oberland, Switzerland. The hydroelectric reservoir was built at the same time as Grimselsee. The reservoir"s volume is 13 million m³ and its surface area 0.645 km².The lake may be reached by Gelmerbahn from Handegg at 1,412 m. The funicular"s track with a length of 1,028 ...