Hejaz
Historically, the Hejaz has always seen itself as separate from the rest of Saudi Arabia. The Hejaz is the most populated region in Saudi Arabia; 35% of all Saudis live there. Hejazi Arabic is the most widely spoken dialect in the region. Saudi Hejazis are of ethnically diverse origins.
Levantine Arabic
Ancient Arabia was home to a continuum of Central Semitic languages in antiquity which stretched from the southern Levant to Yemen. The isoglosses associated with Arabic are clustered at the northern end of this continuum, in the northern Hijaz and the southern Levant. This may be in part due to a lack of documentation, but it is clear that Central Arabia was home to languages quite distinct from Arabic. Thus, Arabic can be said to have emerged in the second millennium BC and spread into the peninsula, replacing its sister languages on the Central Semitic continuum.