Natural and Anthropogenic Lakes of River Valleys

This chapter discusses the forms and ways of functioning of the lakes in river valleys in Poland. Due to the specific nature of these objects, which are characterized by a distinct separation from natural and artificial lakes, the knowledge gathered so far concerning the appropriate nomenclature and classification has been systematized. The paper presents bathymetric plans of selected objects which origin is related to both natural and anthropogenic lakes. These objects are an important and underestimated element of small retention.