AAA game maps

I want to make AAA game map like GTA , RUST ,
Please help me any that how I make that like base land terrian ,city .

You have to be more precise:

  • a map for a already published game
  • a map for your own game

? For the first there is or may be a modding community and for the last… well it’s a long long way…Try Games from Scratch on you favorite search engine…

Map for my own game