The name of the Caspian Sea in the classification of Iranian languages

Caspian Sea or sea located in northern Iran, is famous in various fields: history, Geography, Politics, Economics, Tourism and etc. One of the areas where the name of the Caspian Sea is to be found is linguistics. In linguistics, the term Caspian languages is used to refer to a number of languages. This sea Which is part of the northern part of Iran, Has led linguists to always use the name of this sea to refer to languages that have somehow spread on the shores of this sea. Mazandarani, Guilaki, Taleshi, Tati and Semnani are the languages most often spoken in the Caspian languages. In some cases, there is a difference between linguists about how these languages are Classificated. This article, is concentrated on the role of the Caspian Sea in naming one of the branches of Iranian languages. In another section of this article, a number of words with the Caspian will be referenced in the Guilaki language. These words deriving from the Guilaki dictionaries indicate that the Kas people lived in this area or have long been in connected whit inhabitants of these regions.