Arbuinia is one of the cities and also the capital city of Canreal. While being the capital city it isn't the biggest city. However, Arbuinia has the most money and therefore has the most influence on the continent. It is also the home of the royal council. The king of Canreal does not directly live in Arbuinia, but he often visits Arbuinia to consult with the royal council.
Arbuinia is also the first city the player visits in the story.