South Hamgyong Province
Three of the five other hydroelectric systems were located in proximity to each other in South Hamgyong Province north of Hungnam. Each consisted of four plants 5–10 miles (8–16 km) apart along a thirty-mile (50 km) stretch of river, numbered by planners as 1 through 4, with plant 1 closest to its respective reservoir. The northernmost, the Kyosen (P'ungsan) system, was on the Namdae Ch'on with its terminus at Tanch'on. The Fusen (Pujǒn) system was due north of Hungnam on the Songch'on-gang, with its four plants close together but in mountain gorges. The Choshin (Changjin) ran south and then east in the mountain canyons from the Chosin Reservoir and connected with the Songch'on-gang south of Fusen Plant No. 4.