Claimed Gangways
Whether intentional or not pathways crossing over rivers with vegetation growing heavily around the bridge are naturally occuring gateways across Pocket.
Unless manually altered the passage crosses the water but as the foundation here is fairly commonplace they're regularly utilised.
This creates a problem as many people forget to reset the passageway after they have used it.
It can be troubling when done in Suisha as clueless Lu accidentally wander into the wrong place.
Lu can take that opportunity to launch an invasion if the passageway isn't reset.
Letting auhorities know which passages you've used can ensure that Lu don't get the opportunity rather than have authorities have to track down the needle in the haystack.
Long story short don't litter out of convenience and if you do tell the cleanup guys where you left your mess before it starts to fester.