Taiji

- Fairy Forest

Willpower check, almost certainly. Maybe Observation. Apparently, it's in the south.

- Dark Tower

Anything could be here, but it clearly involves magic and possibly traps, so Agility and all that. It could be anywhere.

- Hill of Suicides

Besides Willpower, there doesn't seem to be anything else here, and we'll probably need to eliminate this strange/magical phenomenon that affects people. East.

- Glade of the Dead

Something like a swamp with the undead? A cemetery? Or maybe it induces sleep, and you sleep until you die, which makes it similar to a hill. Tenacity and Willpower? Southwest?

- Church of Cultists

It's clear here; we need to burn it down, along with the house. West?

- Gemstone Mine

Cave-ins? Mine inhabitants? I suspect you can sneak through. Maybe southeast.

- Peak of Death

Agility checks (boulders!), reflexes, endurance, if you go on foot. Enemies - birds? Again, probably somewhere in the east.

- Cave of Death

Spiders, resistance to poison check, Tenacity?. South or east.

- River of the Dead

I have no idea, but it's probably in the west, near the settlement. And the settlement is probably made up of some kind of undead.

Tower, River, Church - west
Forest, glade, cave - south
Hill, peak, mine - east