Isle of Frost

The Isle of Frost is an island that appears in Phantom Hourglass. When Link first arrives, the isle is barricaded by massive, icy walls that he must use his cannon to destroy before he can dock. The Island has two primary races of creatures on it: the Anouki and the Yook. Despite bad blood between them, both were at peace with each other for 100 years, living on opposite sides of the island, until a Yook sneaked into the Anouki village, and disguised itself as one of them. Link must resolve this conflict, and then get the Azurine from the Temple of Ice. After he clears the dungeon, it's revealed that the Yook were being mind-controlled by an evil force, and that they are actually quite friendly.