Wikipedia
Hunchun
Hunchun is a county-level city in the Yanbian Korean Autonomous Prefecture, far eastern Jilin province, Northeast China. It borders North Korea ( North Hamgyong province) and Russia ( Primorsky Krai), has over 250,000 inhabitants, and covers 5,145 square kilometers. It was capital of Balhae/Bohai Kingdom between 785-793 as " Dongyang".
The city is located near the point of junction of the borders of China, Russia, and North Korea; provided with an observation platform, it is a popular tourist attraction.