Nation land would be land owned by a nation. You would not be able to build on it (I'm actually not even sure what we should do with it atm but heres an idea:
Pvp, people in allied, same nations would be safe in their own nation lands, enemies would be marked, perhaps with a red name tag and would experience PVP normally).
Any plot/wild can be nation land aswell as town/wild land. Nation land would not be claimed, instead it would be earned through the towns it owns. It would be an average between different towns in the nation.
+Nation A
- Nation B
0 Nation C
Town
++++++ - - - - - -
++++++ - - - - - -
++++++ - - - - - -
++++++ - - - - - -
++++++ - - - - - -
++++++ - - - - - -
000000++++++
000000++++++
0000000+++++
000000000+++
- - 000000++++
- - - o00000+++
- - - - - 000++++
- - -+++++++++
- -++++++++++