The Moving Island is aa giant island but what makes it special is its ability. The island is said to be on the back of a dealing when in reality it is just a giant boat (not as big as Morias). This Island boat is the main vase of the Nightmare Pirates on this supposed island are their headquarters a giant building surrounded with cannons. It's rumored to be able to fly and go underwater its unknown if its true but whenever this ship arrives it keeps most of it under the waves to make it seem much smaller.