Dwynnen was a barony on the southern coast of High Rock, in the Iliac Bay region. It existed in the late First Era, as well as in the late Third Era. It shared borders with Anticlere to the southwest, Urvaius to the west, Phrygias to the north, the Wrothgarian Mountains to the northeast, and Kambria and Bhoriane to the east. Its capital was the city of Dwynnen.
According to legend, the province was created shortly after the man who would become the first Baron Othrok emerged from the wilderness and defeated the lich of Castle Wightmoor and its undead force. The Battle of Wightmoor is believed to have taken place in 3E 253, and is celebrated by the people of the barony every 5th of Sun's Dawn.