By the green river, there is a grey city. The city, I infer from this map, is called Tokchon, and it lies on the headwaters of the Taedong, above Pyongyang, and above the slave-worked coal mines of Camps 14 and 18.
The city is coated in soot, a deathly blanket reminiscent of scenes we haven’t seen since the fall of Ceausescu’s Romania. Click for a full-size image.
Search the streets for signs of life, and you will find few. I searched for five minutes before I even saw a truck. In places, the shadows seem to show that the buildings are vacant.