| Category | Marvels |
| Location | unknown |
| Owner | Geb |
| Built | unknown |
Deep within the interior of Bal-Kriav lies the grand keep of Geb, a location known as Deepest Deep. Surrounding this colossal fortress are infinite tunnels and caverns. In these areas, Geb maintains physical fitness through regular exercises, some of which give rise to the Snores of Geb or the more perilous Exercises of Geb.
Geb and his underlings likewise monitor the machinations of Surtur. Surtur, governing the lava that flows through Bal-Kriav, perpetually seeks a means to transform the terrain into an expanse of scorching flame.
In their devotions to Geb, the most venerable priests have heard the deity speak of the Inner Realm, a magnificent domain at the core of Bal-Kriav. Within the Deepest Deep, it is said, lie portals to this peculiar realm, safeguarded by the mightiest of earth elementals, stone dragons, and golems larger than any mortal has beheld. Yet many dismiss this talk as mere ramblings of aged clerics, intent on extolling the power of Geb.