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.
Eastern Arabia
The Arab states of the Persian Gulf are solely Eastern Arabia, the borders of the Arabic-speaking Gulf do not extend beyond Eastern Arabia. The modern-day states of Bahrain, Kuwait, Oman, Qatar and UAE are the archetypal Gulf Arab states. Saudi Arabia is often considered a Gulf Arab state although most Saudis do not live in Eastern Arabia.