Just some world building here.

[hider=Northern Region][img=http://img4.wikia.nocookie.net/__cb20130127062110/onepiece/images/6/6a/Punk_Hazard_Ice_side.png][/hider]

[hider=Southern Region][img=http://1.bp.blogspot.com/-PDvUH2ZTmfw/Ucf5-MTgytI/AAAAAAAACLQ/kiJFfLItzL0/s1600/1000x546_643_Saltmine_2d_illustration_concept_art_ruins_horses_warriors_skeletons_fantasy_picture_image_digit.jpg][/hider]

[hider=Eastern Region][img=http://www.wallsave.com/wallpapers/1920x1080/anime-girl-demon/1072145/anime-girl-demon-pin-in-the-forest-of-red-hair-x-on-1072145.jpg][/hider]

[hider=Western Region][img=http://img1.ak.crunchyroll.com/i/spire3/130de35c4a656e2a6eaa75b3908d362d1349363201_full.jpg][/hider]

[hider=Central Region][img=http://images.forwallpaper.com/files/thumbs/preview/35/355345__anime-city_p.jpg][/hider]