Файл:North Rhine-Westphalia location map 01.svg

Own work, based on (not all layers may be visible or included):

• File:North rhine w template 2.svg by TUBS (for borders)
• Bezirksregierung Köln: Nordrhein-Westfalen in Zahlen und Karten (for rivers)
• Ministerium für Umwelt und Naturschutz, Landwirtschaft und Verbraucherschutz des Landes Nordrhein-Westfalen: Bäche/Flüsse/Seen (for rivers)
• Landesumweltamt Nordrhein-Westfalen: Gewässergüte in Nordrhein-Westfalen (for rivers)
• File:Netherlands Limburg location map.svg, by Erik Frohne (for rivers and borders)
• File:Netherlands Overijssel location map.svg, by Erik Frohne (for rivers and borders)
• File:Netherlands Gelderland location map.svg, by Erik Frohne (for rivers and borders)
• Hessisches Landesamt für Umwelt und Geologie: Wasserrahmenrichtlinie in Hessen (for rivers and borders)
• File:Municipalities in Rhineland-Palatinate.svg by TUBS (for rivers and borders)
• For populated areas, either:
  • Bezirksregierung Köln Übersichtskarte NRW 1:500.000 für Nordrhein-Westfalen (may be substituted by www.maps-for-free data in later versions) or
  • www.maps-for-free.com
• Wasser- und Schifffahrtsverwaltung des Bundes: Bundeswasserstraßenkarte DBWK1000 (for channels)
• For topography and hill shades, either:
  • www.maps-for-free.com (like in File:North Rhine-Westphalia Topography 02.png by TUBS) (may be substituted by SRTM data in later versions) or
  • NGA's and NASA's SRTM3 data provided to me by user Alexrk2, much like applied in File:North Rhine-Westphalia relief location map.jpg
• Alexrk2 also helped me with corrections of the projection of my maps thus becoming a equirectangular projection maps. Alexrk2 provided me this help via email but the application of his/her corrections werde first made public by uploading the file File:North Rhine-Westphalia relief location map.jpg

Only to compare some issues:

• Ministerium für Umwelt und Naturschutz, Landwirtschaft und Verbraucherschutz des Landes Nordrhein-Westfalen: Fließgewässer, Kanäle und Seen in NRW