The historical district of Al-Yamamah at its greatest extent, as described by Yaqut (13th century) and Al-Hamadani (10th century), along with some of the region's prominent settlements in pre-Islamic and early Islamic times.
Al-Yamamah (Arabic: اليمامة al-Yamāmah) is an ancient district lying to the east of the plateau of Najd in modern-day Saudi Arabia, or sometimes more specifically, the now-extinct ancient village of Jaww Al-Yamamah, near Al-Kharj, after which the rest of the region was named. Only a handful of centralized states ever arose in Yamamah, but it figured prominently in early Islamic history due to it becoming a central theater in the Ridda Wars immediately following Muhammad's death. The region was gradually subsumed in recent centuries under the term "Najd", which encompasses a larger area. However, the term "Al-Yamamah" still lives on as a nostalgic historical term that is invoked to emphasize the region's ties with its ancient past. The current headquarters of the Saudi government in Riyadh, for example, is known as the Palace of Yamamah.
^[Akbar Shāh Ḵẖān Najībābādī, History of Islam, Volume 1, p. 194. Quote: "Again, the Holy Prophet «P sent Dihyah bin Khalifa Kalbi to the Byzantine king Heraclius, Hatib bin Abi Baltaeh to the king of Egypt and Alexandria; Allabn Al-Hazermi to Munzer bin Sawa the king of Bahrain; Amer bin Aas to the king of Oman. Salit bin Amri to Hozah bin Ali— the king of Yamama; Shiya bin Wahab to Haris bin Ghasanni to the king of Damascus"