As explained in [[world topology#The Void line]], there is a gigantic and towering mountain range over the void line. Opposite to this effect, in the middle of the sunny region is a wavy mountain range, not as tall. I want a desertic region, maybe stuck in an "enclosure" of mountains in the sunny region. Thus, it doesn't receive much humidity from the oceans. Based on the waviness of the mountains, reflect on how the Coriolis effect affects the air currents: where is it humid, windy, etc. A lot of lakes and rivers, otherwise there isn't much of water except in the Dark Oceans.