http://www.eea.europa.eu/data-and-maps/figures/drainage-basins-of-regional-seas-1
http://www.forskning.se/temaninteraktivt/teman/ostersjon.4.432ffcf123f048005f8000321.html
http://www.ifitweremyhome.com/compare/SE/DE
http://maps.grida.no/go/graphic/population_density_in_the_baltic_sea_drainage_basin
