Question: Beaver County is a county located in the U.S. state of Oklahoma, it is located in the Oklahoma Panhandle, the extreme northwestern region of the state of Oklahoma, in which country?
Sentence (from "Black Mesa (Oklahoma)"): It extends from Mesa de Maya, Colorado southeasterly 28 mi along the north bank of the Cimarron River, crossing the northeast corner of New Mexico to end at the confluence of the Cimarron River and Carrizo Creek near Kenton in the Oklahoma panhandle.
Relevant evidence: No