Hi, this is what I know.The Cambodian dispute with Thailand centres on 1.8 square miles of scrubland near the ancient Hindu temple, which sits on the jungle-clad escarpment that forms the natural boundary between the two countries.
The International Court of Justice awarded the ruins to Cambodia in 1962 in a ruling that has rankled in Thailand ever since. I don't know why the court did not rule on the disputed bits of land lying nearby.