Yanbian, officially known as the Yanbian Korean Autonomous Prefecture, is an autonomous prefecture in the east of Jilin Province, China. Yanbian is bordered to the north by Heilongjiang, on the west by Baishan and Jilin City, on the south by North Korea's North Hamgyong Province and on the east by Primorsky Krai in Russia. Yanbian is designated as a Korean autonomous prefecture due to the large number of ethnic Koreans living in the region. The prefectural capital is Yanji and the total area is 42,700 square kilometres.
The prefecture has an important Balhae archaeological site: the Ancient Tombs at Longtou Mountain, which includes the Mausoleum of Princess Jeonghyo.
Wikipedia https://en.wikipedia.org/wiki/Yanbian_Korean_Autonomous_Prefecture
Coordinates 42°54'25.186" N 129°27'48.309" E