What are the limits of 裏日本 ? (matter of geography)
裏日本 (うらにほん) : "back Japan" in english, I think ; "Japon de l'intérieur" en français.
Does it mostly concern a geographical aspect, or a economic one, or a sociological one ?
Regarding to its extensive limits, it applies to 北海道 and the sea coastal areas, I think, but are 九州 or 四国 absolutely not concerned ?
Thanks for your help / よろしくお願いします
:-)