The chief streams are the Sangch'ŏn and Pujŏn Rivers.

Sinhŭng county is divided into 1 ŭp (town), 3 rodongjagu (workers' districts) and 21 ri (villages): Agriculture dominates the local economy.

Lumbering and hydropower are also part of the local economy; relatively little mining takes place.

Ryu Kyong-su Tank Factory is located in the area.

It is a single overhead bidirectional line with a potential passing loop built between 2013 and 2017.