When Jiang Wang came to Qi Country, he crossed the Long River early on, passing through Fertility Country, Ji Country, You Nation... all the way to Qi Country.
Actually, he did it with the intention to deliberately avoid Jinguo, traveling to the slightly northern part of the Central Region.
The three veins of the Taoist Sect stand together in Jinguo; in all the Taoist-associated countries, it is undeniably the core. The newly escaped Jiang Wang from Zhuang Country subconsciously wanted to keep his distance from it.
Had he been familiar with the route beforehand, he could have simply followed the Long River downstream, taken the water route close to Summer Country in the Southern Territory, and then headed north to Qi Boundary, which would have been much faster.