Prison Island (監獄島) is a Field Track in Xenoblade Chronicles, composed and arranged by Manami Kiyota. It is track 1 of disc 4 from the Xenoblade Original Soundtrack. This music is heard while the party is at Prison Island on their first visit during the Mechon assault on Eryth Sea. In addition, it plays during the cutscenes when the party meets Zanza for the first time at the end of this initial Prison Island sequence.