Tumangang
Tumangang-rodongjagu () is a neighbourhood in Sonbong, Rason, North Korea, near the China–North Korea–Russia tripoint where the borders of the three countries converge. It is also the closest town in North Korea to the border with Russia, being located across the river from the Russian settlement of Khasan and the Chinese settlement of Fangchuancun. The Korea Russia Friendship Bridge connects Tumangang and Khasan and is the sole crossing point on the long North Korea–Russia border. Trains coming from and going to Russia are handled by Tumangang Station.