I do not even really know this part of Bohemian Forest. Not that I have never heard of Black and Devil's Lakes, but I have never been there. And because of what I wrote in the previous article, i.e. that travel is returning to its original rhythm very slowly, we have met almost no one on any of the lakes. The starting point for us was Železná Ruda.

Black Lake (German: Schwarzer See) is the largest glacial lake in Bohemian Forest and also the largest lake in the Czech Republic, if we do not count the water areas created with human contribution. It has an area of 18.47 hectares. It lies at an altitude of 1008 meters above sea level and its maximum depth reaches 39.8 meters. It was formed in the last ice age. It is located six kilometers northwest of Železná Ruda, less than one kilometer from the Czech-German state border. The lake lies below the northern slope of Jezerní hora, which rises above it with a 320-meter-high Jezerní wall. It is one of the karst lakes excavated by a glacier during the Würm icing. The black color of the lake is caused by the reflection of the dark forests that surround it. The bottom of the lake is formed by a rock, on which there is currently a layer of sludge about nine meters thick, which forms pollen from the surrounding trees, which has been deposited here for thousands of years.

Devil's Lake (Teufels-See in German) is a legendary karst lake also created during the Würm icing. The lake is located in the Royal Forest on the southeastern slope of Jezerní hora at a distance of about four kilometers from the village of Špičák near Železná Ruda. The lake lies at an altitude of 1030 meters above sea level; its area is 9.71 hectares and a depth of up to 36.5 meters. The lake has the shape of a semicircle and is surrounded by primeval spruce. It is the only one of the Bohemian Forest glacial lakes to belong to the Danube basin.