This unique atlas presents the results of a large international (Finland, Norway, Russia) multi-medium, multi-element, geochemical mapping project covering 188,000 km² in the European Arctic. The Russian part of the area is heavily industrialised while Finland is one of the most pristine regions in Europe. Comparison between different media and results from different chemical extraction techniques allows a better understanding of the levels, sources, cycling and fate of chemical elements in the environment.