The drawn regions cross over many existing political borders. The key in the bottom ride defines a number of different Slavic language families and cultural groups. The region covers a significant portion of what was then the USSR and crosses political boundaries that are not drawn on the map with completely impunity. Large portions of Poland and Germany are shown to contain significant “Slavic” populations. No explanation is given as to how the categories were determined or drawn out or how the information to draw the map was gathered.