Horní nádrž Dlouhé Stráně, Hydroelectric reservoir in Loučná nad Desnou, Czech Republic

Horní nádrž Dlouhé Stráně is a reservoir in the Jeseníky Mountains, situated at around 1350 meters elevation to store water for power generation. The basin fills between mountain slopes and creates a calm water surface surrounded by hiking trails.

Construction of the reservoir began in 1978 and finished in 1996 as part of a large energy facility for generating electricity from water power. The project arose during a period when Czechoslovakia was modernizing its infrastructure.

The reservoir's name, Dlouhé stráně, refers to the mountain whose flattened summit it occupies. Its walls were sealed with natural asphalt imported from Albania, and the water is moved through two underground conduits 1.5 km long and 3.6 m in diameter. The site is freely open to walkers and cyclists.

A paved road leads visitors about 8 kilometers uphill to the water, where you can walk and enjoy the views. The route works for both pedestrians and cyclists and offers chances to explore the surrounding mountain landscape.

The reservoir's walls are sealed with natural asphalt imported from Albania, and two 1.5 km conduits of 3.6 m diameter run beneath the surface to move water to and from the plant. The perimeter embankment dam measures 1750 m.