need help with ideas on how to do map

map is main part of the game needs to be big and able to zoom in to territories after selection to select an exact spot the map is a big part of my game and needs to be basically an exact replica of the earth once you select a continent you need to be able to select a region then a certain place and select an target

Sounds like you want a view of earth which you can select your continent, zoom in to pick a region of that continent, then zoom in to a further selection on a smaller scale (IE City or landmark)

This sounds like a very big undertaking, but having no idea of what your game is, or consists of, the scale seems VERY large and ambitious…
Unless there doesn’t need to be a high amount of detail… a game kind of like Risk? is what I have in my mind