Alne

«Aarun» (sometimes spelled as Alne) is the largest city at the base of the World Tree in ALfheim Online and the capital of ALfheim, until Yggdrasil City is established. It is known to be a neutral city and, even after the establishment of Yggdrasil City, acts as a raiding base for the advanced dungeons on the Aarun plateau as well as the central trading market for all races.

Due to its size, this city has been divided into five zones: North, South, West, East, and Central. The World Tree's Dome located at the Central Zone. The city also holds four dungeons located north, south, east and west of the city, with their deepest floors having stairs leading to ALO's most difficult dungeon, Jötunheimr. There is also a secret alley, which is not shown on the map, that leads to a locked wooden door, which can only be opened with a certain key, obtained after escaping Jötunheimr through the said door. The door leads to a staircase leading to Jötunheimr.

Near the foot of the World Tree stands a gate that leads to the dungeon which leads to the top of the World Tree. Players must defeat the guardians guarding the inner gate to be able to pass through and complete the first Grand Quest to meet the Fairy King Oberon, who is supposed to grant the successful fairy race with eternal flight, but it is later revealed that the dungeon was not supposed to be beatable by the players, as even if by some chance a player would reach the inner gate, they would still not be able to enter through it without admin authority. After ALO was acquired by Ymir, an elevator connecting Aarun to the newly established Yggdrasil City at the top of the Tree was created.