Usagi Ocean (海洋の卯, "Kaiyō no Usagi", Viz: "Rabbit Ocean") is the second largest ocean in the world. It is named after Kaguya Ōtsutsuki for it is said that the ocean was once land until she punished a revolting peoples and sunk their continent. The Usagi is the ocean where the Shinobi continent and the Shijin resides and as such it is very busy and extremely important to world affairs; over 90 nations exist within these continents alone. Because of this, trillions of ryō in profits travel through the seas day and night. This very fact is the reason that a new-class of pirate gangs have been searching the waves high and low to catch any unsuspecting ships carrying goods.