The place is filled with many lava pools. There are many volcanic mountains around the area. It doesn't seem to be able to support most forms of life. Some of the volcanic mountains may by buildings/homes for the fire people, such as the Flame King's castle located on the left in the picture above. The sky in this land is deep red and a haze of smoke also covers parts of the area. Only a fire elemental can survive in the high temperature, that is why you need a flame shield.
- Marceline has been to the Fire Kingdom, she mentioned it in the episode "Evicted!" But the odd thing is, she didn't have any protection from the fire, which means she should have been in pain, due to the fire. But it is later confirmed that Marceline is just lying about it.
- In the episode "My Two Favorite People" the tital card shows the fire kingdom on the borders of the grass lands.