Ragnarok Online is divided into a series of maps on two major continents, each of which has its own terrain and native monsters, though many monsters are present in multiple regions. Transportation between maps requires loading the new map and monsters are unable to travel from one map to another unless directly associated with the player such as a pet, mount, or hireling.
There are three major nations in Ragnarok Online, the first of which and where all players start is the kingdom of Rune Midgard. The Schwaltzvalt Republic, an industrialized neighbor to the North, was added in Episode 10 and Arunafeltz, a religious nation is the subject of Episode 11.
Areas from Norse mythology are included, such as Niflheim, the land of the dead, and Valhalla, where players can become Transcendent Classes. New map content is constantly being added to game in the form of Episode updates.