Wow, Osaka way higher than I thought. To be more than half of Tokyo but a significant portion less of population!
Okinawa missing? Not sure about GDP per area, but I thought it will have the lowest GDP per capita but apparently it's Nara https://en.wikipedia.org/wiki/List_of_Japanese_prefectures_by_GDP_per_capita
Darn I thought this was a topography map
More like an inverted topography map, as people usually avoid mountains