Wonsan, previously known as Wonsanjin, is a port city and naval base located in Kangwon Province, North Korea, along the eastern side of the Korean Peninsula, on the Sea of Japan and the provincial capital. The port was opened by Japanese forces in 1880. Before the 1950–1953 Korean War, it fell within the jurisdiction of the then South Hamgyong province, and during the war, it was the location of the Blockade of Wonsan. The population of the city was estimated at 329,207 in 2013.