Scientists created the first-ever map of this vast underground fungal network and found it could stretch to the sun and back more than a billion times.
Global topsoils hold an estimated 110 quadrillion kilometers of fungal network, a distance equivalent to traveling to the sun and back a billion times.
The study: Global density and biomass of arbuscular mycorrhizal fungal networks
Might have something to do with this: https://scienceinpoland.pl/en/news/news%2C109008%2Cpoland-still-among-europes-most-polluted-particulate-matter-rises-expert-warns
Hmm perhaps, although I still wouldn’t expect the border to be so well visible on the map. Because diffusion doesn’t know political borders