Had this pop up during world generation. Evil temperate grassland in the middle of a lake, in the middle of a mountain range, with a mysterious lair. Strike the earth! Or maybe let's go somewhere else, instead.

Generated with a high number of civilizations, so you have plenty of origins to choose. 100 year history.

Mods:
Advanced Agriculture
Advanced Orchards
Ceramics Expanded
Enhanced Trade
Goblins Aren't Immortal
No Cave Adaptation
Cave Spider Syndrome Recovery
Recycle Clothes and Armor
Cartilage Rots