Varieties of Arabic
There are many varieties of Arabic (also called dialects of Arabic or vernacular languages) in existence. Arabic is a Semitic language within the Afroasiatic family that originated on the Arabian Peninsula. It is classified as a macrolanguage comprising 30 modern varieties, including its standard form. The largest divisions occur between the spoken languages of different regions. Some varieties of Arabic in North Africa, for example, are not easily comprehensible to an Arabic speaker from the Levant or the Persian Gulf. Within these broad regions further and considerable geographic distinctions exist, within countries, across country borders, even between cities and villages.
Old South Arabian
Old South Arabian (or Ṣayhadic or Yemenite) is a group of four closely related extinct languages spoken in the far southern portion of the Arabian Peninsula. There were a number of other Old South Arabian languages (e.g. Awsānian), of which very little evidence has survived, however. A sole surviving Sayhadic language is attested in Jabal Rāziḥ in far north-west of Yemen, though the varieties of speech in neighboring areas have both Arabic and Sayhadic features, and it is difficult to classify them as either Arabic dialects with a Sayhadic substratum, or Sayhadic languages that have been restructured under pressure of Arabic.