The Eastern Region Frontier City is on the easternmost edge of the Eastern Region. You would have to cross the entire Eastern Region and pass by major sects such as the Five Elements Escape Sect and Hualong Sect to get there. The journey is approximately 36,000 kilometers in a straight line.
Even if Chen Dengming and He Yingyu were to fly in a straight line on the high-level tier 3 Spirit Boat - the Golden Containing Inverse Light Boat, they would still require almost twenty-four hours of non-stop flight to reach their destination.
However, they dared to speed up only because of their sheer confidence and lack of fear of any dangers on the way.
Since they wished to keep the details of their journey a secret, they had to avoid certain areas occupied by large sects and Immortal's gateways. They couldn't take a straight route, as they risked being caught by the Sects' Formations, or being spotted by high-level cultivators in the skies, thereby revealing their tracks.
