The vast raised peat-bog called Jezerní (area of over 200 hectares) is extending between the villages of Horská Kvilda and Kvilda. The entrance to the Jezerní peat-bog leads along a short instructive path starting from the small parking site on the left side of the road from Horská Kvilda to Kvilda and continuing along a wooden footpath. An observation tower standing by the entrance offers nice views of almost the whole peat-bog. Jezerní peat-bog is one of the coldest places of our country (with annual average temperature of 2 °C) and with high rainfall totals, which is why its vegetation consists predominantly of psychrophilic species. In the intact parts of the raised bog we can see the vegetation cover of the "peat-bog" dwarf pine. Its undergrowth consists of Common Heather, Common Bilberry, Lingonberry or Black Crowberry. At the free areas we can for instance see Tussock Cottongrass, Bog Bilberry, Bottle Sedge, Dwarf Bog-Rosemary, Cranberry Marsh, Round-Leaved Sundew, and Dwarf Birch. At the Jezerní peat-bog there are many forms of invertebrates (e.g. spiders, dragonflies or butterflies) as well as vertebrates (Common European Viper, Viviparous Lizard, Common Redpoll, Winchat, Black Grouse, etc.)