The Natura 2000 sites can extend to some or all of the areas and objects covered by other forms of nature protection. Data on the area Nature 2000 sites (presented in the Local Data Bank, the LDB) do not include information on areas located at sea. The absolute area of the Natura 2000 sites transferred annually to the European Commission (the EC) is the result of spatial analysis of summing the vector boundary layer in software belonging to spatial information systems. The value of the area transferred to the EC (including areas located at sea) differs in relation to the sums of the areas of individual voivodeships and the sea due to the dynamics of state borders (e.g. the eastern and western borders shift along with the progressive meandering of the rivers constituting the border; their current shape is different than at the time when the oldest Natura 2000 sites were designated). Work on specifying the course of the boundaries of the designated Natura 2000 sites is still in progress, so the areas of the designated sites may change in the future. Source: data of the General Directorate for Environmental Protection.