High Quality Content by WIKIPEDIA articles! Yanbian Korean Autonomous Prefecture is an autonomous prefecture in Jilin province, in the northeastern China. Yanbian is south of Heilongjiang, east of Jilin's Baishan City, north of North Korea's North Hamgyong Province, and west of Russia. Yanbian is designated as an autonomous prefecture due to the large number of ethnic Koreans living in the region. The prefectural capital is Yanji, and the area is 42,700 km². The Prefecture has an important Balhae archaeological site: the Ancient Tombs at Longtou Mountain, which includes the Mausoleum of Princess Jeonghyo. The prefecture is subdivided into eight county-level divisions: six county-level cities and two counties. Both Chinese and Korean are used as official languages in Yanbian Ethnic Korean Autonomous Prefecture. Most ethnic Koreans in this area are bilingual. Like Koreans living in the Korean peninsula, ethnic Koreans in Yanbian use Western punctuation in writing.