Here’s an attempt to overlay this map with a population density one. It’s rough but I couldn’t think of a better way to show the info with what’s available. Red is still a football field, but now non-football-field land is green. Population density is blue. This means that football field + high density = magenta, no field + high density = cyan, field + low density = red, and no field + low density = green. Reference colours in the Bay of Biscay. It seems like the UK is basically a perfect density map, rural France loves football, eastern Europe in general is less bothered about the sport. I’m quite surprised by how few are in Spain too, given the country’s legacy in football