Night sky darkness is measured at a level of between 0–22, with 22 being total darkness. Places closest to that are the best for viewing the night sky. Recent measurements in River Murray International Dark Sky Reserve came in at 21.97! The region consistently measures an exceptional level of darkness, commonly about 21.8 and in some areas achieving the highest measure of 21.99. This is in part thanks to significant shielding from the nearby Mt Lofty Ranges which border Adelaide's urban light.
The River Murray International Dark Sky Reserve is the first of its kind in Australia. Covering more than 3,200 square kilometre and located less than 90 minutes from Adelaide, the dark skies can be enjoyed as an evening trip or why not stay a few nights and visit the region too?