Historically, Belovezhskaya Pushcha is a highly swampy area. The total area of ​​swamps is over 40,000 hectares, or more than 30% of the forest’s territory. Over the course of history, the wetlands of the forest have been significantly developed by humans. Forty-nine percent of the swamp area has been drained (16 swamps with a total area of ​​19,983 hectares), 12 small rivers have been straightened, and hundreds of forest reclamation canals have been dug. Due to land development in some areas of Belovezhskaya Pushcha, the groundwater level has dropped by 50–150 cm. Due to lack of moisture, spruce stands suffered first, followed by ash stands. Therefore, the work carried out to restore the disturbed hydrological regime is particularly valuable for Belovezhskaya Pushcha. Thus, using the example of the restored water regime of the Plyanta object (work was carried out in 2016) of the Korolyovo-Mostovsky forestry, one can already observe the positive dynamics of natural processes from repeated swamping.