Explain the 4 regions of the Arabian Peninsula in your own words

Before the modern era, the region was divided into primarily four distinct regions: the Central Plateau (Najd or Al-Yamama), the Arabian Sea and Indian Ocean Coast (South Arabia or Hadhramaut), the Persian Gulf Coast and Gulf of Oman (Eastern Arabia or Al-Bahrain), and the Red Sea Coast (Hejaz or Tihamah)

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