This paper compares the development of Holocene vegetation in Bela krajina and Ljubljana Marshes (Ljubljansko barje) regions of Slovenia. The results of pollen analysis suggest that in Bela krajina the human impact on the environment (forest clearance and burning) was very intensive throughout the Holocene and led to changes in forest composition, increased biodiversity, and the formation of a mosaic landscape. In the Ljubljana Marshes, forest burning and clearance seem less intensive, although changes in forest composition and ‘anthropogenic indicator’ pollen types were detected. These differences between study regions are presumably a consequence of various climates, hydrology, bedrock and land-use in the past.