Shadowdeep is the darkest region of the world. No light reaches this area from above or below. It lies above the Voidbarrens, which are lit with void, and Barathrum and the core, which are lit by magma. In Shadowdeep, light cannot survive.

Countries:

• Aathachingok:
• Dagosilagudd:
• Holothu:
• Lhohothag: the Lhohothagan chthonian country.
• Mephatharsh: the nightgaunt country.
• Rlhuauli:
• Zatsinora: the country of spirits that protect the Spirit Gate.

Shadowscapes:

• Bothakulgr River: a true shadow river running from Ebonlake and through Mephatharsh.
• Ebonlake: the lake of true shadow that dominates the center of the region.
• Iguateiagoan: the mountains that surround Ebonlake.
• Night Wood: a forest of night wood trees that are on ground, wall, and ceiling of the caverns.
• T'ddaualigh Marsh: a marsh near Ebonlake.

Spiritscapes:

• Atigote River: a spirit river that runs through Zatsinora.
• Eholldhen: the series of crevasses, canyons, waterfalls, rivers, and tunnels that lead to the Spirit Gate, past Zatsinora.
• Phauguacthos Wilderness: a vast wilderness lit by spirit energy where impossible creatures dwell, all of them unique.
• Rtlothih Forest: a spirit wood forest.
• Spirit Gate: a gate that connects all planes.