All Things GiantsMysterious “Plain of Jars” in Laos has been dated Posted on March 30, 2021March 30, 2021 by Administrator After years of speculation a team of researchers has pinpointed the age of this ancient mystery. The stone jar sites scattered around Laos are considered the most unique and important archaeological finds in all of Southeast Asia. In total, over 90 sites have been identified, with each site containing between one and 400 jars, some of which weigh up to 20 tons.