Copypsting from mapedit.pdf in \Dominions II\doc\ folder:
#specstart <nation> <province> ,
where <province> is the province number and <nation> comes from this table:
0 Abysia
1 Atlantis
2 Pythium
3 Man
4 Ulm
5 Ctis
6 Arcoscephale
7 Caelum
8 Ermor
9 Marignon
10 Pangaea
11 Vanheim
12 Jotun
13 R'lyeh
14 Mictlan
15 T'ien Chi
16 Machaka
EDITED because apostrophes
' didn't show properly.