Abstract: The lakes over Romania’s territory are relatively uniformly distributed within most physico-geographical regions. A low density is specific to the West, where significant drainage works have been realized, while the highest density is characteristic to the North-East, with numerous ponds, registered since the 14th-15th centuries. Most of the lakes within the Romanian territory, especially those analyzed in the present study, are anthropic. Most of the natural lakes are small-dimensioned and they do not have a special ecologic or economic importance. Although situated in different physical-geographical conditions, the analyzed lakes are mostly included in the category of good waters from a qualitative point of view, and within the eutrophic, mesotrophic or hipertrophic category, from a trophic point of view. Because of the fact that most lakes are anthropic, it is obvious that they are artificially maintained at this stage. Most of the mountain lakes and those in the volcanic areas are ultra-oligotrophic and oligotrophic. The lacustrine wetlands in the mountainous units are relatively meagrely developed, as their distribution is limited by the morphology of the landforms.