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The Fláje water reservoir was built on the Flájský stream in 1963 and its purpose was to supply water for the region around the Krušné hory Mountains (the Most and Teplice areas). The dam is 56 m high and 416 m long. The dam is a concrete pillar gravity type, the only type of its kind in the Czech Republic. Upon request you can visit the interior of the dam that looks like a concrete temple. The maximum depth of the reservoir is 57 m and its area is 149 ha. The water is led through a feeder tunnel above the village of Meziboří to a small hydroelectric power plant and water treatment plant. On the south bank of the reservoir is connected the Flájská game reserve with an important mating area for the black grouse. The game reserve has been open to the public for several years and it invites you for a walk or cycling trip; in winter on its south bank a cross-country track has been formed that is a part of the Krušnohorská bílá stopa (the Krušné hory Mountains White Track) between the villages of Klíny and Dlouhá Louka.
Less than 1 km from the dam the Flájský floating channel begins that was built in the 16th century for the floating of wood. The channel goes above the village of Český Jiřetín (where a man-made waterfall was created) as far as the German village of Clausnitz, where the channel ends in the Freiberg Mulda River. From there the wood was floated to Freiberg, where it was burned to charcoal.