The border area of the secret territory was generally very clearly delineated.
This was actually a buffer zone purposely set up by God Capital to prevent hunting trial participants from accidentally entering an area that was beyond their cultivation level.
Under normal circumstances, if hunters were to set foot in an area where prisoners were extremely scarce, they would soon realize that they might have already crossed into the border area.
Of course, following the setting up of this border area, prisoners also rapidly learned to make use of it. Some injured prisoners would hide here to nurse their wounds. In order to avoid excessive internal friction between the prisoners, God Capital tacitly condoned this type of behavior. However, after recovering from their injuries, prisoners had to leave this area.