nikos you went kinda offtopic ..
Well, I guess I will (finally) create a topic and explain how to create a zone, since many ppl got problems (if no lazy).. :P
Go to you zone/place and draw it with nodes like (various examples on zone folder)
These X stands for your X, Y. Cuboid just need two corners and its auto generated. Cylinder need only one center point and you use radius to draw it. With Cuboid you can draw w/e shape you wish. To put a Z check use /loc and see what Z it is and do it like +-50/100 or even more - depends of the zone terrain, if there are hills or not, so you won't leave the zone when you go on some hill / mountain :P
When you are done with the zone, you can do like nikos said - go to admin panel and use Visualize option to see the zone - adena on the ground will ceate the path.