sources to be the dividing line between Europe and Southwest Asia. According to that, the highest peak in the Caucasus, Mount Elbrus (5,642 meters) located in western Ciscaucasus, is considered the highest point in Europe. The Kuma-Manych Depression, the geologic depression that divides the Russian Plain from the North Caucasus foreland is often regarded by classical and non-British sources as the natural and historical boundary between Europe and Asia. Another opinion is that the rivers Kura and Rioni mark this border, or even that of the river Aras. The Caucasus is a linguistically, culturally and geographically diverse region. The nation states that compose the Caucasus today are the post-Soviet states Georgia (including Adjara and Abkhazia), Azerbaijan (including Nakhchivan), Armenia, and the Russian Federation. The Russian divisions include Dagestan, Chechnya, Ingushetia, , , , Adygea, Krasnodar Krai, and Stavropol Krai, in clockwise order. Three territories in the region claim independence but are recognized as such by only a handful of entities: , Abkhazia, and South Ossetia. Abkhazia and South Ossetia are largely recognized by the world community as part of Georgia, and as part of Azerbaijan. General statistics of South Caucasian states Demographics The region has many different languages and language families. There are more than 50 ethnic groups living in the region. No fewer than three language families are unique to the area. In addition, Indo-European languages, such as East Slavic, Armenian and Ossetian, and Turkic languages, such as Azerbaijani, Kumyk language and Karachay–Balkar, are spoken in the area. Russian is used as a lingua franca most notably in the North Caucasus. The peoples of the northern and southern Caucasus mostly are Shia Muslims, Sunni Muslims, Eastern Orthodox Christians or Armenian Christians. History Located on the peripheries of Turkey, Iran, and Russia, the region has been an arena for political, military, religious, and cultural rivalries and expansionism for centuries. Throughout its history, the Caucasus was usually incorporated into the Iranian world. At the beginning of the 19th century, the Russian Empire conquered the territory from Qajar Iran. Prehistory The territory of the Caucasus region was inhabited by Homo erectus since the Paleolithic Era. In 1991, early human (that is, hominin) fossils dating back 1.8 million years were found at the Dmanisi archaeological site in Georgia. Scientists now classify the assemblage of fossil skeletons as the subspecies Homo erectus georgicus. The site yields the earliest unequivocal evidence for the presence of