However, you can manually define an area's color: The color definition used the default RGB values, which range from 0 to 255 (i.e. Feel free to give a suggestion to make this mod better, and to rate this on whether you enjoyed it or not. The heightmap.bmp file should be in Greyscale mode and saved as a 8-bit bitmap image file (.BMP). sea_starts = controls which provinces are sea zones. This controls the level of development within each area. You would define an adjacency as follows to do this: There must always be one adjacency besides the standard -1 -1 -1 -1 -1 -1 -1 for the game to work.