Our distances are not driving distances, but are calculated as a 'straight-line' (or point-to-point) distance starting from Mulga. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Mulga) to Point B.
Our distance measurements begin at a specific point in Mulga. The point that we are using is located at these GPS coordinates - Latitude: 33.5529, Longitude: -86.9733 [Map]. In this case, the coordinates for Mulga have been provided by the Geographic Names Information System (GNIS).