Hejazi Arabic
Hejazi Arabic or Hijazi Arabic ( '), also known as West Arabian Arabic, is a variety of Arabic spoken in the Hejaz region in Saudi Arabia. Strictly speaking, there are two main groups of dialects spoken in the Hejaz region, one by the urban population, originally spoken in the major cities of Jeddah, Mecca and Medina, and another by the Bedouin or rural populations. However, the term most often applies to the urban variety which is discussed in this article.
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.