Here is an example from where I live. Nearest park where I can “touch grass” is >30 min walk. It’s a very real thing for a lot of people in LA. I’m not going to zoom in to my specific neighborhood but from this screenshot is the proof.

https://close.city/?x=-118.43633&y=34.14025&z=10.91847&r=0&l=1101100001101&tt_63=1 Website for more details.