This is the first time I've encountered a nomination like this.
This one is a prehistoric relics named Batu Congkrang. It's a prehistoric stones from Megalithic period with curved structures (hence its name "Congkrang" by locals). It should be like this:
I could not find any English language related article, but here's the source:
But since it was declared as protected cultural heritage by local government, it's not possible to take the photo of the stones. Instead, this submitter nominates its sign (in the below):
"This object was exist since prehistoric period for about 2000 years ago. It's a sign that there's a human civilization in that area since very long time."
Would this kind of prehistoric sites (or sign of them) eligible?