Tannensee
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Tannensee is a reservoir in Obwalden, Switzerland. In 1958, Tannenbach and few other creeks were dammed with an earth-fill dam. The reservoir has a volume of 3.8 mio m³ and its surface area is Script error: No such module "convert".. The reservoir is used to generate electricity at Kraftwerk Hugschwendi in Kerns.