Tang San spread out the map on the carriage. People gathered around him and looked at the map. They raised their fingers on the map. Tang San said, "We'll be here soon.". Hanhai City, the only port city on the western coast of the Empire, was built along the sea. If we want to go to Poseidon Island, we must rent a boat from the port of the city, and then take a boat to sea for about ten days to...