The Eastern Continent shared a large border with the Western Continent which was divided by only a wide river running between them.
The two continents shared the same distance of border with the Northern Continent and the Southern Continent as well.
The Battleship of the Great Demon Sect, carrying three Elders and their Youngest Disciples, was supposed to cross into the Western Continent from a point that was much closer to the Northern Continent.
This route was chosen as it was the fastest route to reach their destination.
Unlike the Southern Continent, the Eastern Continent didn't have any conflict with the Northern Continent so they felt no need to change the route.
As the Battleship of the Great Demon Sect reached near the river of separation, they noticed the battleships of the Holy Empire on the other side of the river.