rhine-ruhr metropolitam area map with largest cities skylines silhouettes

area bergisch bochum bonn border bottrop cartography city cityscape cologne country deutschland dortmund duisburg dafrac14 sseldorf essen europe gelsenkirchen germany gladbach hagen hamm here illustration krefeld kapara ln land leverkusen map metropolitan moers monchengladbach mulheim neuss nordehein north oberhausen recklinghausen region remscheid rhine ruhr silhouette skyline solingen state street vector westfalen westphalia witten wuppertal