This hand-drawn map from the Budapest City Archives, edited by environmentalists, shows the foreseeable catastrophic outcomes of the Bős-Nagymaros River Barrage System at the common border of Hungary and Czechoslovakia. It shows the prospective heavy impairment of the environment (dereliction, sludging, weeding, dissolution of the circumlittoral forest belt, etc.). The document warned of the dangers of the foreseeable inland water too. It’s evident on the map that the most threatened area in Hungary was Szigetköz and the Danube Bend.