Ulsan
Ulsan (uɭ.s͈an), officially the Ulsan Metropolitan City, is South Korea's seventh-largest metropolitan city and the eighth-largest city overall, with a population of over 1.1 million inhabitants. It is located in the south-east of the country, neighboring Busan to the south and facing Gyeongju to the north. Ulsan is the industrial powerhouse of South Korea, forming the heart of the Ulsan Industrial District. It has the world's largest automobile assembly plant, operated by the Hyundai Motor Company; the world's largest shipyard, operated by Hyundai Heavy Industries; and the world's third largest oil refinery, owned by SK Energy. In 2020, Ulsan had a GDP per capita of $65,352, the highest of any region in South Korea. Ulsan is divided into four gu (districts) and one gun (county): Buk District () Dong District () Jung District () Nam District () Ulju County () Stone tools found at the Mugeo-dong Ok-hyeon archaeological site indicate that Ulsan was inhabited by humans at least as early as the Paleolithic Era. Other findings indicate human inhabitation in the Neolithic Era. Ulsan also contains a substantial number of settlement remains from the Bronze Age. During the Jinhan confederacy, Ulsan was a site of iron mining and production. In the Later Silla period, Ulsan served as an important port for the economic hub of Gyeongju, and likely saw the import of luxury Persian goods such as silver, glass, and peacock tails. In 1592, the future Port of Ulsan was the site of a major battle when warrior monks joined citizen soldiers in resisting Japanese invasion. On January 29, 1598, a combined military operation between Korea and China tried to besiege the castle, but failed as reinforcements from Japan came to delay the fighting. Records from the Joseon Dynasty show that Ulsan was developed as a shipbuilding site as early as 1642. Owing to the two World Wars, Ulsan began to grow as an industrial center. During this time it was part of Keishōnan-dō. In 1962, Ulsan was chosen to become a Special Industrial Zone and in the following year, it formally became a city.