CC3 How do I make an inverse of this map?

Since in the world of Atlan there is a struggle/war between the surface races (including dwarves) and the underworld races.. I need to know how to make basically a negative/inverse version of this map. As for the "underworld" its not truly underground, more of a flat world about 50 miles thick with the exact opposite as the Underworld. So far we have just been using our imaginations and the hand drawn map.

Where there is ice/snow I want fire, lakes of water to become lakes of fire, mountains to become plains, forest to become badlands, swamp to become desert.

Is there some real easy way to convert it over like that or do i have to erase everything and go back to just the bare continental outline and redraw the whole thing?

Redrawing is probably your best bet in the case you describe.

Like Waldonrate stated, you best bet is to save a copy and then redo the map changing the features.

I would do what Knight said, but you may not have to redraw everything. There are some sheet effects which may help