Abstract: This case study refers to forest area dynamics within the Vâlsan Basin, situated between his affluents: Mierlei Valley and Bunești Valley in 1904-2004 period. The dynamics was shown by maps on a temporal scale especially in reference years as 1904, 1973, 1981, 1994, 2004. Forest cover from our study area has been decreased substantially because of the impact of human activities. We can conclude at the end of our paper that forest ecosystems had lost the natural equllibrium, and barely can realize the protective and hydrological function, in the context of declaring our study a natural reserve.