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.
Hasaitic dialect
Hasaitic is an Ancient North Arabian dialect attested in inscriptions in the Eastern Province of Saudi Arabia at Thaj, Hinna, Qatif, Ras Tanura, Abqaiq in the al-Hasa region, Ayn Jawan, Mileiha and at Uruk.
It is written in the Ancient North Arabian script and dates from the 3rd to 2nd centuries BC.