How to change map only in my mod?

[unmerged(315494)]

I wish to change terrain type in some provinces in my mod. How to apply this changes? I know I Have to change file province.csv, but where I have to move in mods folder? I wish to changes will appear only in my mod no in all game.

 

[Lyrecryer]

In misc.txt at the bottom you can choose what map you want. (you should stick a number like Map_2 or something) If you want to change the map itself then it's best to copy Map_1 and name it Map_2 so you then do whatever you want to do.