14.09.2012, 08:57
Inside of the stadium or the outside? If it is the inside, they wont be able to leave anyways. If it is the outside, you can get the world bounds easy by going to one end of stadium and typing /save and then in a diagonal to the other side and type /save.
You will get the MINX, MAXX, MINY, MAXY
You will get the MINX, MAXX, MINY, MAXY