All questions regarding mapmaking for Heroes of Might and Magic 3: The Shadow of Death.

Question regarding the random map template: I created a random map in the editor, size G, for two players. I want a very long game with armies in the millions. I created a lot of zones with rich treasures. The problem is that all the zones are evenly distributed across the map, but there are too many mountains and empty spaces. How can I fix this? What is the optimal number of zones to create for a size G map, without empty spaces?