Researchers have found jars in India that may have been used for human burial practices.
There are 65 sandstone jars that were found in Assam.
They are different in shape and size. Some of the jars are tall and cylindrical, while others are buried in the ground.
Stone vessels have been found in other countries.
The Journal of Asian Archaeology journal published the details of the discovery this week. Tilok Thakuria and Uttam Bathari were from Gauhati University.
We don't know who made the jars or where they lived. Nicholas Skopal, a researcher at the Australian National University who was part of the research team, said it was a bit of a mystery.
The researchers believe that the giant jars were likely associated with mortuary practices.
There are stories from the Naga people of finding Assam jars filled with cremated remains, beads and other material artifacts.
The jars are empty and may have once been covered with lids, according to Dr. Thakuria.
The next step in the project is to document the features of the jars.
Researchers said that similar sites were found in Assam and Meghalaya state in the past.
There are at least 10 sites in Assam containing more than 700 jars. They think these jars are from before 400 BC.
The researchers said they had searched a very limited area in Assam and that there are likely to be a lot more such sites out there. We don't know where they are.
The longer we take to find them, the greater the chance that they will be destroyed as more crops are planted in these areas.
The jars were found in Laos in 2016 and are thought to have been there for at least 2,000 years.
There are three different types of burials: bones in pits with a large limestone block on top, bones buried in ceramic vessels, and a single body in a grave.
The jars found in Assam and Laos are very similar. There is some variation in size and shape. Mr Skopal said that the ones in Assam are more cylindrical than the ones in Laos.