Underworld

The Underworld (アンダーワールド) is the mysterious virtual world in which the Alicization arc takes place. One of the locations is Centoria, which is governed by the Axiom Church. Centoria is divided into four empires: Norlangarth North Empire, Eastabarieth Empire, Wesdarath Empire, and Southacroith Empire. The Human World is where the Humans live in the Underworld, and is ruled by the Axiom Church and the four empires.