Caucasus

From Turtledove

The Caucasus or Caucasia is a region in Eurasia that includes the Caucasus Mountains and surrounding lowlands.

The Caucasus Mountains are commonly reckoned as a dividing line between Asia and Europe, and territories in Caucasia are variably considered to be in one or both continents

The Caucasus is one of the most linguistically and culturally diverse regions on Earth.

It contains three countries: Armenia, Azerbaijan and Georgia.