Unfortunately, we don't know of an official website for Isabel. If you can help, please contact us through our Feedback Page.
The official website for State of South Dakota: sd.gov/
Our distances are not driving distances, but are calculated as a 'straight-line' distance. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Isabel) to Point B.
Our distance measurements begin at a specific point in Isabel. The point we use is located at these GPS coordinates - Latitude: 45.3958, Longitude: -101.4290 In this case, the coordinates for Isabel have been provided by the Geographic Names Information System (GNIS).