The embark for the playthrough is pretty straightforward to find; it's the northernmost volcano on the glacier surrounded by necromancer towers.

Some other features of the world:

A bunch of rivers, and a good number of canyons.
Minimum of 75 volcanoes.
If genned to year 1050, around 10-15 necro towers.
15 levels above 1st cavern.
Caverns min of 80% open, max of 20% tunnels.
A whole lot of civilizations. Necessary for lots of towers.
Mineral frequency roughly equivalent to the 'frequent' preset.