Iso is a city within Ethernia, in the region of Legan. Iso is the easternmost major city of the Yuilnk Kingdoms, which altogether sit in the southwest of Legan. Iso, like many of its neighbors, was historically reliant on trade from the sea. By the late 11th century Iso and the Yuilnk kingdoms' relevance was failing in comparison to their northern neighbors such as Belkush and Viling. By the reign of and the beginning of her hegemony over Legan, the Yuilnk kingdoms as a whole were unable, or unwilling, to resist her control of the region.