Ancient Tombs at Longtou Mountain - Credit: Wikimedia Commons
The Ancient Tombs at Longtou Mountain are the burial sites of twelve royal figures from the Balhae (Bohai) kingdom. It is located on Longtou Mountain, southeast of Toudao Town () in Helong, Jilin Province, China, a region possibly called the "Western Field of the Ran Valley" () by the Balhae people. The mausoleum of Princess Jeonghyo is located here. Read more on Wikipedia
Source: en.wikipedia.org