Legend has it that a race of giants lived on the Xieng Khouang plain of the Laos Highlands, which is no surprise given the huge stone pots that lie scattered across the landscape here. Nobody knows exactly how they were made, but it’s believed the Mon-Khmer people made them in the 1st to 5th centuries AD, either for storage or as funerary urns.
The Plain of Jars is a megalithic archaeological landscape in Laos. It consists of thousands of stone jars scattered around the upland valleys and the lower foothills of the central plain of the Xiangkhoang Plateau. The jars are arranged in clusters ranging in number from one to several hundred. Wikipedia