Languages of the Caucasus
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The languages of the Caucasus are a large and extremely varied array of languages spoken by more than ten million people in and around the Caucasus Mountains, which lie between the Black Sea and the Caspian Sea.
Linguistic comparison allows these languages to be classified into several language families, with little or no discernible affinity to each other.
Families indigenous to the Caucasus 
Three of these families have no current members outside the Caucasus, and are considered indigenous to the area. The term Caucasian languages is generally restricted to these families, which are spoken by about 11.2 million people.
- Kartvelian language family with a total of about 5.2 million speakers. Includes Georgian, the official language of Georgia, with four million speakers, Mingrelian, Laz language and Svan language.
- Northwest Caucasian, also called the Abkhaz–Adyghe, Circassian, or Pontic family, with a total of about 2.5 million speakers. Includes the Kabardian language, with one million speakers.
- Northeast Caucasian, also called the Dagestanian, Nakho-Dagestanian, or Caspian family, with a total of about 3.5 million speakers. Includes the Chechen language with 1.5 million speakers, the Avar language with 1 million speakers, the Ingush language with 500,000 speakers, the Lezgian language and others.
It is commonly believed that all Caucasian languages have a large number of consonants. While this is certainly true for most members of the Northwest and Northeast Caucasian families (inventories range up to the 80–84 consonants of Ubykh), the consonant inventories of the South Caucasian languages are not nearly as extensive, ranging from 28 (Georgian) to 30 (Laz) – comparable to languages like Arabic (28 consonants), Western European languages (20–21), and Russian (35–37 consonants).
The autochthonous languages of the Caucasus share some areal features, such as the presence of ejective consonants and a highly agglutinative structure, and, with the sole exception of Mingrelian, all of them exhibit a greater or lesser degree of ergativity. Many of these features are shared with other languages that have been in the Caucasus for a long time, such as Ossetian.
External relations 
Since the birth of comparative linguistics in the 19th century, the riddle of the apparently isolated Caucasian language families has attracted the attention of many scholars, who have endeavored to relate them to each other or to languages outside the Caucasus region. The most promising proposals are connections between the Northwest and Northeast Caucasian families and each other or with languages formerly spoken in Anatolia and northern Mesopotamia.
North Caucasian languages 
Linguists such as Sergei Starostin see the Northwest (Abkhaz–Adyghe) and Northeast (Nakh-Dagestanian) families as related and propose uniting them in a single North Caucasian family, sometimes called Caucasic or simply Caucasian. This theory excludes the South Caucasian languages, thereby proposing two indigenous language families. While these two families share many similarities, their morphological structure, with many morphemes consisting of a single consonant, make comparison between them unusually difficult, and it has not been possible to establish a genetic relationship with any certainty.
Ibero-Caucasian languages 
There are no known affinities between the South Caucasian and North Caucasian families. Nevertheless, some scholars have proposed the single name Ibero-Caucasian for all the Caucasian language families, North and South, in an attempt to unify the Caucasian languages under one family.
Some linguists have claimed affinities between the Northwest Caucasian (Circassian) family and the extinct Hattic language of central Anatolia. See the article on Northwest Caucasian languages for details.
Dené–Caucasian macrofamily 
Linguists such as Sergei Starostin have proposed a Dené–Caucasian macrofamily, which includes the North Caucasian languages together with Basque, Burushaski, Na-Dené, Sino-Tibetan, and Yeniseian. This proposal is rejected by most linguists.
Families with wider distribution 
Other languages historically and currently spoken in the Caucasus area can be placed into families with a much wider geographical distribution.
The predominant Indo-European language in the Caucasus is Armenian, spoken by the Armenians (circa 4 million speakers). The Ossetians, speaking the Ossetic language, form another group of around 700,000 speakers. Other Indo-European languages spoken in the Caucasus include Pontic Greek, Kurdish, Talysh, Judeo-Tat, Bukhori and of the Slavic languages, Russian and Ukrainian, whose speakers number over a third of the total population of the Caucasus.
The only Semitic language spoken in the Caucasus is Assyrian Neo-Aramaic, spoken by around 30,000 speakers, largely living in cities, who fled to Russia from Turkey in the aftermath of the Assyrian Genocide at the close of the First World War.
Several Turkic languages are spoken in the Caucasus. Of these, Azerbaijani is predominant, with around 9 million speakers in Azerbaijan. Other Turkic languages spoken include Balkar, Karachay, Kumyk, Nogai.
- Encyclopædia Britannica, 15th edition (1986): Macropedia, "Languages of the World", see section titled "Caucasian languages".
- Chirikba, Viacheslav A. (2008), "The problem of the Caucasian Sprachbund", in Muysken, Pieter, From linguistic areas to areal linguistics, John Benjamins Publishing, ISBN 978-90-272-3100-0.
- Caucasian Languages (North and South) Academic Mailing List, run by the Ravenscraig Press
- Map of the Languages of the Caucasus
- TITUS: Caucasian languages map by Jost Gippert& projects Armazi& Ecling
- CIA ethnolinguistic map
- Linguistic families map by Matthew Dryer
- Caucausian Dictionary
- Caucausian section of the Red Book of the Peoples of the Russian Empire
- The Iberian-Caucasian Connection in a Typological Perspective – An in-depth linguistic study of Basque, Georgian, and other ergative languages, concluding that the similarities are not strong enough to prove a genetic link.
- Atlas of the Caucasian Languages with very detailed Language Guide (by Yuri B. Koryakov)
- Comparative Notes on Hurro-Urartian, Northern Caucasian and Indo-European by V. V. Ivanov