So now that we know how to call this sequel Aquaman and The Lost Kingdom, what exactly is the Lost Kingdom? Well, in the first Aquaman movie it was said that there were seven Atlantean kingdoms after the fall of the original Atlantean Empire: Atlantis itself, Xebel, the Brine, the Fishermen, the Trench, the deserters and the lost kingdom. Obviously, we’ll be exploring the latter area in Aquaman 2, with its existence being rediscovered after centuries, if not millennia, of absence. Of course, that only asks more questions. Where is it? Why was is lost? What threats lie in the Lost Kingdom? We will know the answers in about a year and a half.