Spawn on top of the survival island with coral reefs and a shipwreck nearby at coordinates 19 -149. The chest inside the ship holds several enchanted items:
Enchanted Leather Cap - Unbreaking II
Enchanted Leather Cap - Projectile Protection III
Enchanted Pants - Curse of Binding
Additionally, on one of the islands in this area, you will find a buried treasure at coordinates -263 121: