Data source: https://www.openstreetmap.org/
Author: https://old.reddit.com/r/MapPorn/comments/1f38xe2/tennis_court_density_of_europe/
Population map of Europe
3 points
5 points
I think the population density argument plays best here. I’m not as well versed in Spain, but for Portugal the largest concentration is Porto and Lisbon.
2 points