Studies were carried out in six lakes located within the Łęczna-Włodawa Lakeland (the Zagłębocze. the Czarne near Sosnowica, the Głębokie near Uścimów, the Rotcze, the Sumin and the Długie) during the summer season (from June to August) of 2001. They involved physico-chemical parameters (water transparency, conductivity, pH, oxygen saturation, total phosphorus and nitrogen) and also biological ones (chlorophyll-a concentration, phytoplankton abundance and structure, lake into account dominant species and domination of higher taxa). Physical and chemical factors and the phytoplankton composition of lakes usually confirm their trophic character. The mesotrophic Zagłębocze lake was characterised by a high Secchi disc (SD), low abundance of phytoplankton and chlorophyll-a values typical of a low trophic status. Physical and chemical water characteristics and over 90010 domination of blue-green algae showed high trophy of the Czarne lake near Sosnowica. In the shallow, eutrophic lakes: the Rotcze, the Sumin and in the dystrophic the Długie lake high abundance of phytoplankton and chlorophyll-a concentration was also high diversity of species, was recorded. Stability of character of these lakes was thus confirmed. The highest concentration of nutrients and chlorophyll-a and high abundance of phytoplankton with law SD was recorded in the Głębokie lake near Uścimów.