Helo people.

I am trying to map an alternate world map but I am having a real hard time finding what I need to work on. I will use GIMP/CC3 to do it. What I need is a DETAILED blank world map (Earth) that have the contoours of the countrys and, prefencially of the states. The ones I find are low resolution or are outdated, or do not have contours or already have tons of info on it.