Underground World

Underground World (地底世界, Chitei sekai) is a huge cavern that is as huge as Dilhaide and Azeshion combined together. It is cohabited by 3 great countries in conflict with each other.

History
The cavern only came into being some time after Anos Voldigoad's death and reincarnation, so its existence and civilizations are unknown to him.

Dragon God's Country Giordal
The country ruled by the Pope and followers of God.

Dragon King's Country Agaha
The home of the Dragon Knights.

Dragon Overlord's Country Gadesiola
A land without faith, those who enter must abandon it.

Holy City Gaelahesta
The holy city that does not belong to any of the 3 underground world's great countries.