After the tour concluded, the leaders began to return, intending to prepare their donations. They also stationed some representatives of their Clan or Sect in the Academy City for any needs, serving as a form of protection for the Academy.
Compass Carburettor told them that just having the Academy City wasn't entirely safe in long term consideration. So, he created a moat surrounding it, resembling a river in width, spanning two kilometres.
And beyond this river-like moat, more settlements would be erected. This way, more and more people can live in this location, making it the centre of operations for a variety of things.
The various Clans and Sects would each occupy an area here, creating their own territory, also forming a layer of defence for the Academy as all the forces would keep each other in check while also protecting the academy from all external threats.