Even their tendrils have extended to the islands in the eastern seas of Westeros Continent - Dragonstone Island, where they have established an outpost.
Perhaps this is in preparation for the Fortress of Freedom to continue the conquest of Westeros Continent.
This is the overlord civilization of this world, the Valerian Fortress of Freedom, possessing thousands of Giant Dragons, no civilization dares to oppose them.
However, even such an overlord-level civilization cannot explore the far reaches of the Summer Sea, the Sosros Continent. Once, a Dragon Knight of the Fortress of Freedom — Jeninara Beleris and her Demon Dragon Tyrrex.
A man and a dragon hoped to find the legendary Sea of Boiling and River of Steam on the Sosros Continent, but only found endless jungles, deserts, and mountains.
