Nature reserve Leshnitza is situated in the basin of the river Leshnitza and near Yasenovo village. It preserves a variety of ecosystems in the low mountaineous part of the Balkan mountains as well as habitats of rare and protected species. The forests include mainly beech, hornbeam, manna-ash. The main plants are the beeches at the age of 160 years, 18 m high. The reserve is the home of deers, red deers, bears, martens, wild boars, many birds.