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.
Basic Law of Saudi Arabia
Article 1 states that "God's Book and the Sunna of His Prophet" are the country's constitution and Arabic is the official language with the capital at Riyadh.