from Wikipedia Riyadh:
Riyadh (Arabic: الرياض Ar-Riyāḍ) is the capital of Saudi Arabia and its largest city. It is also the capital of Riyadh Province, and belongs to the historical regions of Nejd and Al-Yamama. It is situated in the center of the Arabian Peninsula on a large plateau, and is home to over 4,260,000 people.
The city is divided into 15 municipal districts, managed by Riyadh Municipality headed by the mayor of Riyadh, and the Riyadh Development Authority, chaired by Governor of Riyadh Province, Prince Salman bin Abdulaziz.
The current mayor of Riyadh is Abdul Aziz ibn Ayyaf Al Migrin, appointed in 1998.