Like XKCD said, every map is basically a population map: https://xkcd.com/1138/

The interesting part is in the delta between population and usage.

reminds me of when i see articles in the news in my country sometimes, with headlines like : "Man found with drugs within 500 meters of school"

There are schools everywhere, usually in places where there are lots of other amenities like shops, and doctors, and pubs.