Today's map is the plane of Gehenna, Formed out of four impossibly huge volcanoes floating in an endless black void, with little open ground anywhere. The slopes are always in between a 45 degree angle to a full-on cliff face. Aside from the rocky and soot-stained walls, the dangerous terrain (lava, the River Styx, acidic ash) and the hostile inhabitants (Yugoloths and other fiends) make Gehenna a thoroughly unpleasant place.