There is a line that runs down 5119/5120 on the map0.mul it is hardcoded into the UO client. The rule with that is you cannot continue terrain from the left to the right. Otherwise you can do whatever you want there. Most people fill it with black and then build dungeons, like EA has done. The other alternative is like T2A. Build whatever landmass you want there, just border it off with mountains or some other impassable terrain (like stars). If you are using less than the rest of the map area for your main map, you can also border that off with impassable terrain and then use the surrounding area for dungeons or other small areas.
The map2 and 3 don't have any such restrictions that I am aware of. Although EA has chosen to section them off, I don't see any reason why you couldn't use the entire map area for 1 map.
_________________ This space for rent.
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