A linguistic archipelago
The Caucasus Mountains are a "shatter zone," a region of extreme political and cultural fragmentation. Here, the fragmentation is linguistic. More than 50 distinct ethnic groups reside in this area, which is roughly the size of Spain. The deep valleys and high peaks created pockets of isolation, allowing languages to evolve independently over millennia. This intense geographical separation is the main reason for the region's unmatched linguistic density.
The indigenous languages fall into three main families that have no clear relation to each other: Kartvelian (South Caucasian), Northwest Caucasian (Abkhazo-Adyghean), and Northeast Caucasian (Nakh-Dagestanian). This is not a single "Caucasian" language family; the groups are as different from one another as they are from English or Mandarin. The region also contains languages from the Indo-European, Turkic, and Semitic families, introduced through historical migrations and conquests. Despite centuries of influence from Persian, Ottoman, and Russian empires, the core linguistic diversity of the Caucasus has persisted. The Republic of Dagestan in Russia is the most linguistically varied part of the region, home to about 30 indigenous ethnic groups.