A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Unless stated otherwise, all information herein is taken from TWoRJTWoT, Ch. 11.
Author: Atarah al'Norahn
Oman Dahar was one of the nations of the Free Era. It was located in the western part of the Westlands. To the northwest was Abayan, with Indrahar to the north, Oburun to the northeast, Masenashar to the east, Farashelle to the southeast, and Darmovan to the southwest. Eventually, this area of land became what is now part of Arad Doman and the Mountains of Mist.
Oman Dahar's Fall
By FY 963, Oman Dahar had fallen to Hawkwing.