Foggy about Map Create/Edit Process…

[J Henry Waugh]

Created .tga file in Gimp. Made new map (and saved successfully) in map edit. Understand all about corresponding *.map file and Unix editing.

But very confused about this part in the mapedit.pdf guide:

Load in your tga file and click in all borders and terrains

I understand about the little legend menu on the left and toggling the terrain types and neighbors and all… …but what I don't get is how the association is made between the province borders themselves. What is the magic that makes dominions2 recognize that there are 36 provinces in my homedrawn map and that if click in spot A it's province #6 and if I click in spot B it's province 11? I seem to end up with not having any provinces and don't understand how that piece works…