https://en.wikipedia.org/wiki/Provinces_of_Saudi_Arabia
History. After the unification of Saudi Arabia, the kingdom was divided into seven administrative-territorial entities: the 'Asir Province, Al Hasa' Province, the Hejaz Province, the Najd Province, the Rub' al-Khali Province and the Shammar Province.. King Fahd bin Abdulaziz Al Saud issued Royal Order A/92 on March 2, 1992, known as the Regions' System, which provided for the division of …