[Therion] How to join areas

Hello everyone - Is there a way to join areas? I have a cave map with a bunch of scraps each containing a portion of the stream. I defined an area on each scrap of type "water". When the final map is compiled, the joins between the scrap walls is fine but the stream join is not. Is there a way to smooth this out? I have fiddled with the area border some and that helps, but it is never a smooth join. There is always a discontinuity from one scrap to the next. Therion 5.3.0 on Fedora 14 Regards - Bill Gee