The Ancient Tombs at Longtou Mountain (龙头山古墓群) are a collection of 12 burials for royalty of the Bohai Kingdom. It is located on the Longtou Mountain, southeast Toudao Township (头道镇), Helong County (和龙市), Yanbian Korean Autonomous Prefecture, Jilin, China. The most famous of the burials is the Mausoleum of Princess Zhenxiao.

The Burials were made the a unit of the third series of Protected National Cultural Artifacts (重点文物保护单位) by the State Council on January 13, 1988. The area was possibly called "the Western Field of the Ran Valley" (染谷之西原) by the Bohai people, as a Bohai document indicated that is the place where Princess Zhenxiao was buried.

The burial cover an area with the diamters east-west 500 metres, north-south 400 metres. After being made a Cultural Artifacts unit, the protected area expanded to the west 0.5 kilometre to Fudong River (福洞河), west 5 km, north 5 km.

There are three burial zones:

• Dragon Lake (龍湖)
• Dragon Sea (龍海)
• Stone Kingdom (石國)

The walls, especially the murals, have been covered with anti-corrosive chemicals. There are also protective personnel on site, so administrative offices were constructed near the Mausoleum of Princess Zhenxiao.