Riamon is a realm of Mithgar. It is bordered by Aven on the north, by Garia on the east, Pellar and Valon to the south, and by the Grimwall on the west. It is divided into North Riamon, of which the capital is Dael, and South Riamon.
During the reign of Arkov the Usurper, Riamon was occupied by troops from Garia and Alban. There were many uprisings against occupying troops, which were ultimately successful in the final days of Arkov's reign. An army from Riamon joined an army from Aven after both kingdoms were liberated to march on Caer Pendwyr and assist High King Reyer in retaking the city.
- Princess Laurelin was a native of Riamon.