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 territory is an elevated, deeply dissected plain with a height of about 200–220 m. The rocks of the Upper Cretaceous are the relief-forming ones. The climate of the area is moderately dry and continental. The hydrographic network is represented by the Don, Tolucheyevka, Podgornaya, and Osered rivers. The soils are represented by ordinary chernozems, sandy soils, sandy loam, meadow-chernozem and carbonate chernozems, gray forest soils, salt marshes are common. 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 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.