Bogs on guard of Europe. Bogs and swamps have been drained for hundreds of years, mainly for agricultural purposes, to gain land for cultivation. Bogs are those peatlands where the peat-forming process is active, which requires the substrate to be properly saturated with water. That is why, at the moment, in both Finland and Poland, peatland renaturation projects will take place on land owned by the state treasury. This (peatland renaturation – ed.