My colleague Nancy Beavan as been working for some time now at the Cardamom Mountains in western Cambodia, investigating a series of jar burial sites associated with a little-known culture who were living contemporaneously with Angkor. This news video from VOA Khmer is an overview of the project and the latest finds.
A couple of recent features on Nancy Beavan’s work in the Cardamom Mountains in Western Cambodia (disclosure: Nancy is a personal friend of mine). Stashes of burial jars found in at least 10 sites there reveal an unknown culture who lived in the highlands and had interactions with a declining Angkorian state. [Edit: Alison pointed out that the second article is from two years ago. My apologies, although I haven’t indexed it before so am leaving it here. Thanks Alison!]
Burial jars in the Cardamom Mountains. Source: Phnom Penh Post 20150112