From Giskard

Looks like most of the info you posted was as I had guessed it would but. The only thing you didnt mention that I noticed is colour zero.

I found in my tests that the sea/land border (that purple pink line) must use colour zero or the map doesnt work. Can you confirm this ? I also noticed that the actual colour doesnt matter which would seem to contradict the region rules you outlined above.

Can you clear this up for me please ?

Im currently half way through the setborder numbers on my own campaign having done exactly what you wrote above already. Is it save to simply paste in a lot of random numbers and know they will be ignored or even better leave them out entirely ?

As you know those numbers are a pain. I have 25 land regions and 15 sea regions. Each region has an average of 4 borders. Im sure everybody can work out how many entries that adds up to