Transformation of the morphometry of Lake Osieckie – largest lake in the Holy Cross region

Abstract The paper presents the analysis of transformation Lake Osieckie, largest lake in Holy Cross region until 2016. It is a valley that according to cartographic materials had undergone no changes shoreline since ca. 1938. nearby activity sulphur mine required building three dikes on lake, dividing it into four independent water bodies. their morphometric properties comparison those original lake. Although basins new lakes are natural origin, currently existing can be described as quasi-natural.