It consists of Southern Russia, mainly the North Caucasian Federal District's autonomous republics, and the northernmost parts of Georgia and Azerbaijan.
The Ciscaucasus lies between the Black Sea to its west, the Caspian Sea to its east, and borders the Southern Federal District to its north.
The peoples of the northern and southern Caucasus tend to be either Sunni Muslims, Eastern Orthodox Christians and Armenian Christians.
Twelver Shi'ism has many adherents in the southeastern part of the region, in Azerbaijan which extends into Iran.
These kingdoms were later incorporated into various Iranian empires, including Media, the Achaemenid Empire, Parthia, and the Sassanid Empire, who would altogether rule the Caucasus for many hundreds of years.