There was indeed a head and a tail. At the front and back ends of the Black Tortoise Island, there was an area for movement. It was like the head and tail. There were also four limbs that could be moved. There was a reason why it was designed this way. Before Zhao Hai went into seclusion, Wen Yuming and the others had designed it and showed it to Zhao Hai. Zhao Hai had agreed to it, so it was designed this way.
The reason he did this was to make it more convenient to collect those islands. Don't underestimate the head, tail, and limbs of the Black Tortoise Island. Not only could these places be used to attack, but most importantly, these places could also store the islands into the body of the Black Tortoise Island. Because these places could be moved, it was more convenient to collect the islands.
