Data source: https://www.openstreetmap.org/
Author: https://old.reddit.com/r/MapPorn/comments/1f38xe2/tennis_court_density_of_europe/
Population map of Europe
Data source: https://www.openstreetmap.org/
Author: https://old.reddit.com/r/MapPorn/comments/1f38xe2/tennis_court_density_of_europe/
Population map of Europe
At least in Western Germany, there has been a tennis boom in the 1980s and 90s when Boris Becker and Steffi Graf were active and successful. Thus, you can still see the inner German border between GDR and FRG on the map.