What historical regions does the city where MA'ADEN's corporate headquarters are located belong to?
Riyadh Riyadh (/rɨˈjɑːd/; Arabic: الرياض‎ ‎ "ar-Riyāḍ" ] ) is the capital and most populous city of Saudi Arabia. It is also the capital of Riyadh Province and belongs to the historical regions of Najd and Al-Yamama. It is situated in the center of the Arabian Peninsula on a large plateau and home to more than six million people.
Subeihi Subeihi or Subayhi (Arabic: الصبيحي‎ ‎ "aṣ-Ṣubayḥī "), or the Subeihi Sultanate (Arabic: سلطنة الصبيحي‎ ‎ "Salṭanat aṣ-Ṣubayḥī " or Arabic: سلطنة الصبيحة‎ ‎ "Salṭanat aṣ-Ṣubayḥah "), was the westernmost state in the western Aden Protectorate. It was one of the original "Nine Cantons" that signed protection agreements with Great Britain in the late 19th century. In 1948, it came under the sway of the Sultanate of Lahej and is now part of the Republic of Yemen.