To make this cover I cut out the map of Arctic from a school atlas. The map is 20 cm in diameter, so it hides almost all the cover of the pocket cahier and there's "a piece of land" to fix the cover without glue. 

But if you drip a bit of glue to fix the cover, you'll be able to use it as a usual map.

You can also bend the edges of the cover that still go beyond, but I didn't do that yet. 

The next one for me is Antarctic: a friend of mine is a scientist and every year he visits the continent with an expedition. 

Thanks for your attention! :-)))