Sunch'ŏn is a city in South Pyongan province, North Korea. It has a population of 297,317, and is home to various manufacturing plants. …Sunch'ŏn is a city in South Pyongan province, North Korea. It has a population of 297,317, and is home to various manufacturing plants. The city is on the Taedong River. In 1413, the name of the city became Sunchon, due to a renaming rule in the early Joseon, where 'ju ' were changed to 'chon ' and became Sunchon-gun. The original name referred to a smooth repelling of invaders.