Road of Kings

From AoCWiki

The Road of Kings is a trade route in Hyboria. The road goes through Zamora, Corinthia and Nemedia all the way through Aquilonia and down to Argos. It is unknown wether the road started in Khauran or Turan, but it is unlikely that the road was built during the Hyborian Age, seeing as many of these nations are in constant war against eachother, it is more likely its existence predates the Hyborian kingdoms.