The Osetno nature reserve was established on November 14, 2008 and covers an area of 111.59 ha. Osetno is a forest reserve, but at the same time one of the first mycological reserves in Poland, protecting rare and endangered species of mushrooms. There are at least 240 species of fungi here, 7 of which are legally protected and 53 species are rare and endangered. The most important goal of protection is to preserve cap fungi occurring in forests and forests with a high proportion of decaying wood. It is very conducive to the development of various microflora. There are sites of very rare fungi of varicose veins and black-scaled goose.
In the Osetno Reserve you can meet various forest formations, beech forests, riparian forests, spring alder forests, as well as ponds and ponds. The relief is very varied, thanks to which the landscape is very picturesque. In addition, there is a refuge for rare species of birds. You can meet, among others, white-tailed eagle, red kite and small flycatcher.
You cannot go mushroom picking here, but the blue trail is available for hikers. Bolesław Czwójdziński. It leads from Szczecin Klęsków through the Arboretum in Glinna, Dobropole Gryfińskie to Kępa Bukowa near Cisewo.