The method of land use in the direct surrounding of the reservoir significantly affects its functioning. The main factor influencing the degradation of small water bodies is agriculture [25]. Among all types of land use forms, surrounding of the studied reservoirs were dominated by one natural type of ecosystem. In Sobibor the most frequent type of surrounding were grasslands, but in Leczna Lakeland its’ forest complexes. Definitely, the majority of small water bodies were rectangular in shape (Table3).