There is this topic:
http://www.ryandor.com/forum/viewtopic.php?t=1794
However, the guy fixed the very problem I am having, thus I was unable to get any helpful information from it. I'm using DragonMod11 to make the map, and have followed instruction very carefully. However, I end up with this:
http://www.geocities.com/rorygriffin13/coastprob.jpg
Using mod 9 i was able to at least get the coast transition, but even then it was messed up (had some odd peach static tile around it...) If there is something I'm missing, please let me know!
Thank you very much,
Rory