Our distances are not driving distances, but are calculated as a 'straight-line' distance that stretches from Sulphur Springs. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line from Point A (ie- Sulphur Springs) to Point B.
Our distance measurements begin at a specific point in Sulphur Springs. The point that we are using is located at these GPS coordinates - Latitude: 35.4917, Longitude: -92.2968 [Map]. In this case, the coordinates for Sulphur Springs have been provided by the Geographic Names Information System (GNIS).