Asgard

Asgard is on the various dimensions from Norse mythology, and the only man-made one save for the junction Yggdrasil dimension. Asgard is the location of much of Norse mythology's bosses and mythic items.

Geography
Asgard has an Earth-like climate and geography, made to resemble the geography of real life Scandinavia. Its primary geographic attributes are mountains, plains and fjords. Asgard is divided in 12 regions separated from one another by mountains and water. Asgard is enclosed within a massive stone wall, whose only entrance is where the Bifrost reaches Himinbjorg. Contrary to Hades or Mictlan, The different regions of Asgard generally don't have distinctive climates, although some regions can be more forested or more mountainous than others.

Contrary to Duat, Mictlan, and to some extent, Hades, Asgard is non-linear: taking the Bifrost to Asgard will take the player to Himinbjorg, and is free to explore the rest of Asgard from there on.