Underground Forest is a forest in the Gourmet World. The drop from the "Waterfall Basin of Life" leads to a 20,000-meter deep crevice, the bottom of which contains the "Underground Forest". Full of dangerous Gourmet World beasts with unfathomable capture levels, the Underground Forest has many dangers. Mainly, because of its depth, the gravity is several times stronger than it would be on normal ground. The Forest is also full of many plants and trees that create strong climates, such as the "Air Tree", whose fruit produce high-quantities of various gases, like oxygen, carbon dioxide, and carbon monoxide, the "Heat Planet", a mysterious orb with a high center of gravity that travels around freely, giving off enormous quantities of heat while also lessening the effects of the gravity change from the drop, and the "Fall Tree", a tree that unleashes a large deluge so thick it is like a waterfall and drowns its prey so that it can then absorb them through its roots.