[Minrhael]

In my current game I have decent gem income, but no astral or water income. I've managed to crank out a few clams, but obviously at 40 gems/clam it's not efficient so it's taking me awhile, but I've finally reached the point where I can slowly produce astrals so I can cast Acashic every 5 turns or so without hurting my other gem resources too much.

I assume based on the fact that I usually find nature gems in forests and air in mountains etc that the sites are at least to a degree terrain-linked. Since I can't cast Acashic often, and I really need sources of water and astral, what terrain types should I be casting in first (other than underwater provinces of which I have zero). I've been assuming provinces with rivers and coastal, but haven't had any luck so far.