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
Go see in person or find better data. Spain is a desert between big towns. Poland has only 35ish M people on all that land. You can drive for hours in west Balkans without seeing a single settlement. Croatia, for example has less than 4M people in an area which is bigger than the Netherlands. The Netherlands has like 18M people.