The correct answer here is Asia, Africa and Europe.
The Silk Road is one of the most important trading networks that ever existed in the history of mankind and it is preserved as UNESCO World Heritage Site. It connected the East and the West and it was central for both the economic and cultural interaction between two parts of the world.
It was controlled by the Roman Empire, and only Roman citizens were allowed to fish or swim in it. Hope that helps!
Travel by water was quicker and better for long distance. However boats need to be built and are bulky. Travel by land is stealthier. Both have safety risks. Storms and jagged rock play a risk in water transportation. Land transportation can also be more exhausting, and more suspect to pillaging.
