We're in lava zone 3
Having never seen lava in person in my life, categorizing neighbourhoods by their likelihood to get covered in lava (if I understand that correctly) seems completely alien.
The 3 word address thing reminds me of of one of @dominic's talks. I don't remember which one, but it featured a bit about proquint.
The scuttleverse is the only medium I use where a post about decluttering and running leads to talking about lava and coordinate systems. Pretty neat!