Aethiopia was the largest city in Union, Zoa. Since it wasn't just a city but a kingdom that managed to stand hand in hand with the other three kingdoms in the Union. It covers the best coastline of Zoa and is a very rich land. It's also the direct and mainline for merchants and transportations between Azurel and Zoa, Union's main business partner.
In order to go to Aegis kingdom from Aethiopia, one needs to first go to Karadan, another kingdom in the Union, and then go to Navaren using the great bridge. The city where the great bridge was, was called Magna. A mid-sized city in karaden about a 1-week journey from Aethiopia.
The group rented 4 namets, a blue kenguru type beast with wings. It was very common transportation used in the Union. You could hire namets in one city and return them in another. This transportation system was fully controlled by the council of 12.