[4] At that time, the government of Czechoslovakia decided to initiate the construction of the upper reservoir for the Dlouhé stráně Hydro Power Plant, which led to a significant alteration of the mountain's appearance.

Additionally, the mountain stands out as the middle peak among three summits (Vřesník – Dlouhé stráně – Mravenečník), all of nearly the same height.

At the summit, there is a prominent viewpoint situated near the southern semicircle of the reservoir, with notable rock blocks and a tourist stop named Dlouhé stráně (vyhl.)

According to a detailed map from the State Administration of Land Surveying and Cadastre, the highest point of the mountain is on one of the rock blocks at an elevation of 1,353.8 m above sea level, with geographical coordinates 50°04′16.54″N 17°09′24.34″E / 50.0712611°N 17.1567611°E / 50.0712611; 17.1567611.

[8] The upper reservoir of the Dlouhé stráně Hydro Power Plant, located near the summit, has an irregular oval shape in the horizontal projection, approximately 710 m long and 240 m wide.

Around the reservoir, there are asphalt roads (an upper one for pedestrians) and 50 m below (a lower one for bicycles), from which landscapes of the surrounding mountains can be seen.

Near the northern semicircle of the reservoir, at about 1,335 m above sea level, there is a rectangular asphalt area measuring 70 × 25 m, featuring a small kiosk (fast food)[5] and a scooter rental shop, offering rides down the mountain.

[13] During the excavation of rock tunnels, geologists also found paragneisses with amphibolite and pegmatite inclusions in the mountain massif.

[5] The Czech Tourist Club has marked one hiking trail on the mountain: Kouty nad Desnou – Skály mountain – U obrázku pass – Medvědí hora – Kamenec (1)[e] – Mravenečník mountain – Dlouhé stráně peak – upper reservoir of the Dlouhé stráně Hydro Power Plant – U Okenní štoly There is a possibility to visit the upper reservoir via a combined route from Kouty nad Desnou, taking a chairlift to Medvědí hora slope,[25] from where an asphalt path leads to the upper reservoir and the peak itself.

[5] A particularly popular route is the ascent around Dlouhé stráně, which runs along an asphalt road from Kouty nad Desnou through the picturesque valley of the Divoká Desná river, offering scenic views of the neighboring mountains.