The boundaries were a part of the Underworld was in the world of the living. It is created to seperate the Midlands, Westland and D'Hara. The Boundry Wardens had the job of keeping people away from the Boundaries so the creatures that escaped from the Underworld did not grow stronger and terrorize more innocent people. No one could enter the Boundary and live because it is made up of the Underworld and anyone who entered the boundary would be sucked into the Underworld to die. Kings Port is a place where there is a hole in the Boundry where people can pass between Westland and the Midlands, but it is very dangerous, Adie lives by Kings Port and helps people who pass through the Port.