The geography of Robukan will be better explained by little Reika.

 

As she said, the north is controlled by the empire of Asgard, the south contains the desert lands of Asmara (where Monster girls on tour begins), limited by a huge desert, the west is the land of Lakota, limited by the infinite ocean at the west and mountains at the north, the east is composed of many isles united under the capital, Nion pa, and the middle tropical zone is composed of merchant villages making profit of the light strait, being Potoka the most important, and the one where most of Guild adventure takes place. Every land has its own kind of races and acceptance on humanoid monsters.