Is the middle part that is all red one large conurbation being built up in the entire area or is there some countryside in that. Likewise for the black areas along periphery, how rural are they? I know they have lower population densities but still seem to have plenty of smaller cities. I have driven through the black areas and seemed mostly countryside but usually Autobahns in Germany tend to have trees along the side to block off side so hard to tell.
There is also Lippe (in North-East corner of NRW) that is few places in Germany with strong Calvinist tradition. Like Auerk in North Western Germany, that is also Calvinist and SPD country.
