United States, Arkansas, Benton, Northwest Benton County. Ozark Plateau: Foothills of the Boston Mountains, along Spavinaw River, 1 to 10 mi. east of the Oklahoma border.
36.383313 -94.48777 +-8604m. WGS84
Coordinates centered in (and uncertainty radius fits) a polygon drawn for Spavinaw Creek ("Spavinaw River") where it runs 1-10 miles E of the AR-OK border.