I want to draw a map of a fictional world, which consists of two regions (countries), separated by mountains.
Are there any tools which allow you to draw such maps with little effort?
All the possible software are available here: http://www.cartographersguild.com/showthread.php?t=1407
Not so fast but free and with almost unlimited possibilities: If you want to draw, I would recommend Inkscape (vector) and Gimp (raster) both can be good but work differently.
Fast but not free:
Fast and free:
In addition, I've wrote a blog post on our unofficial blog here.
Here is a different idea for making your fictional countries. Copy real ones.
This is from a map of the world. There are lots and lots of very realistic places in the world and you can have the maps for free. I have labeled the countries and your requested mountains. Rivers are there. Some nice islands to the east. If you want to drill down for more detail, or copy the cities too, you will need a different map of this area but that is fine. Copying real things is fast and free and if someone gripes that it is unrealistic, you can show them where you borrowed it from.
Someone clever enough to figure out where you borrowed your map from will smile if they recognize other features of that area which have come along into your story.
If anyone wants to guess where I took this map from, put your guesses in ROT13 code in the comments.