The purpose of this study is to assess the representativeness of the network of protected areas of the Kalach ravine-girder southern forest-steppe landscape area (Voronezh region). The studied area is located in the central part of the Voronezh region to the east of the Don River. The landscape and ecological contrast of the area has led to a variety of vegetation cover; there are large arrays of oak forests, calciferous-petrophytic and halophytic steppes, floodplain communities, sandy steppes and pine plantations are represented on sandy terraces and zanders. The network of operating protected areas on the territory of the Kalachsky landscape district includes 1 state federal reserve, 2 state regional nature reserves, 1 natural landscape park and 24 natural monuments of regional significance; the number of projected protected areas is more than 40. Mosses were collected by the route method from 1982 to 2024. More than 80 objects have been studied. The in-house treatment was carried out using generally accepted bryological techniques. Herbarium collections are kept in the stock herbarium of the Galichya Gora Nature Reserve (VU). The bryoflora of the Kalach ravine-girder southern forest-steppe LR is characterized by a high level of species diversity (146 species). Only 16 % of the species composition of mosses are frequent and abundant, eurytopic species; 17 % have sporadic distribution and low or moderate abundance; more than 60 % of species have low occurrence and low abundance. A number of rare species have been identified in the bryoflora, 19 of which are listed in the regional Red Book and 3 are recommended for inclusion in the next edition. Full coverage of territorial protection of all locations has not been recorded for «red book» species; in 12 species none of the known locations has a protected status; in other species, only 30–50 % of the locations are located in protected areas. The nature monuments «Virgin slopes near the village of Lipovka», «Steppe slopes along the Tolucheyevka river», «Park in the village of Vorontsovka», «Solontsovaya Polyana», «Vorontsov miracle», «Golden Kust», natural park «Lomy», nature reserves have the greatest environmental value in terms of protecting mossy from among the existing protected areas «Rassypny Yar», and the «Stone Steppe». The projected protected areas are characterized by a high species richness of mossy and a significant proportion of rare species: GPP «Oak forests and steppes on the right bank of the Bityug river», «Krasniansk steppes», «Indychiy», «Valley of the Kozinka River», «Valley of the Pykhovka River» «Valley of the Danilo River», «Upper reaches of the Podgornaya River», PP «Bayrachny oak forests near the village. Mikhailovsky», «Bayrachnaya oak grove near the village of Medvezhye», «Zachikha», «Limestone outcrops on the right bank of the Savala River near the village of Rusanovo», «Steppe slopes on the right bank of the Dobrinka River», etc. The degree of duplication of the characteristic steppe and forest-steppe landscapes of the Kalachsky LR in the current system of protected areas is insufficient for their reliable protection. Such types of tracts as oak forests with outcrops of bedrock, halophyte groupings, grass steppes on loess-like soils, floodplain communities, sandy steppes and old-age artificial pine forests on floodplain terraces of rivers require urgent protection.