cylindrical stone jars with wide bottoms & narrower tops at the plain of jars, phonsavan, laos dec 2015

2019 annamese annamite archaeological asia burial central cordillera cylindrical foothill funerary heritage important indochina jars landscape lao laos laotian megalithic mountain phonsavan plain plateau practice prehistoric principal province range researcher scattered site sites southeast stone unesco urn valley world xiangkhoang xiangkhouang