So. The civ names here are awesome. "Magical Volcano". 2 Bodices, a Bust and a Lance. I vote for Magical Volcano. It's inspiring.

OK. So I'm including a pic or two in there to let you know my reccomended sites. Make your work easier.
There's Flat
There's Volcano
...and there's this evil desert with no aquifers, and Dolomite as the first layer. That one doesn't need a map.
It's big, it's evil, and it's right in the middle of the worldmap. Depends if you want to catch giant scorpions, I guess.

There should be minimal layers between caverns, but 25 was what I set before the first cavern.
Note: Titans attack after 250000 wealth and 100 dwarves
Demons are... supposedly not existant. Not sure I trust a "0" wordlgen perameter, though.
Caverns should have some land, but have vast pools to draw from.