Ashfire Island is the name of an island somewhere around Whitewings that is home to a volcano, or "fire mountain" as the animals in the books refer to it. It is first mentioned in book 2. Almond and Cedar originally came from Ashfire but had to leave when the volcano erupted. The water there is poisonous to those who were not born on Ashfire, and only a potion made from the fur from an animal from the island can heal them if they drink it. When Sepia washes up there in Urchin and the Rage Tide, she drinks it, and gets ill. Queen Cedar takes off clumps of her fur and Urchin from his mother's bracelet to make the potion, which saves Sepia.