Tumangang
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Tumangang Workers' District is a town in Sonbong, Rason, North Korea. It is the closest town of North Korea to the border with Russia. Tumangang sits on the Tumen River, and across of the river is the Russian town of Khasan. A train connects Khasan with Tumangang, and from there to Rason. Also a road connects between Tumangang and Sonbong.