The Southern Isles

The Southern Isles are the home of Hans, the primary antagonist in Frozen.

Geography
Due to the Scandinavian setting of Frozen, the Southern Isles are most likely located somewhere in southern Norway, or possibly Sweden.

Royal Family
The King and Queen of the Southern Isles have 13 sons, with Hans being the youngest of them. The King and Queen most likely expressed favoritism towards the oldest sons. This left Hans feeling overshadowed, which, eventually, drives him to emotionally manipulate Anna in order to take over Arendelle. This would be the ultimate declaration of power and strength to Hans. He, as king, would no longer be overshadowed by his brothers.