Country map for Kha-lhen

Hello, i’m slowly solving all the problems for mmorpg, now i want to make the country map and i have made a test using terrain heighmap and the piri reis ancient map, this seems will solve my problem having a 3d terrain that will show all the country map, it will require a bit of work matching the mountains texture with the height zones of the 3d but is doable. The problem will be to locate the player position in a grid (each location could contain a town, a quest location as dungeons and similar). So i have to find a way to have an x/y position, how can i make that? with a grid of triggers? or someone has a better and easiest idea?
Map test:

Edit: changed the map with 1 created by me, still working on it