The graveyard is an area on Mazcab. It includes the ancient statue and is near the Nemi Forest and the Airut camp.
If you are killed in PvP during the Mazcab supply run, you will end up in the Graveyard.
Players may also bury small, medium, and large goebie burial charms here for reputation with the goebies.
The Mazcab Graveyard can be found in the South-West portion of the Mazcab overworld. Please see the Mazcab wiki page for methods of reaching Mazcab.
Once through the world window, head north, down the hill. Then, head west at the entance of the Liberation of Mazcab raid. Then head south-west to find the graveyard.