"So they really are hiding here!" Just as the information he'd received indicated, the island was visible even from afar, filled with numerous mechanical fortifications. This was why Zhou Tian believed that the goblins must be hiding there, after hearing about the situation. Now that he had confirmed this with his own eyes, despite not actually seeing the goblins, he trusted his inference even more.
Although many races existed in this world, the majority practiced magic and combat qi. The races which constructed buildings akin to skyscrapers on Earth were few, with the goblins, a part of the NPC population, being among them.
Furthermore, Zhou Tian spotted goblin airships hovering over the island, which gave him even more confidence in his hypothesis.