Ulleung-do (also spelled Ulreungdo; Korean pronunciation: [ulːɯŋdo]) is a South Korean island 120 km (75 mi) east of the Korean Peninsula, formerly known as the Dagelet Island or Argonaut Island in Europe, Dingbian (定邊) in China, and Utsuryo (鬱陵島) in Japan. Volcanic in origin, the rocky steep-sided island is the top of a large stratovolcano which rises from the seafloor, reaching a maximum elevation of 984 metres (3,228 ft) at Seonginbong Peak. The island is 11.3 kilometres (7.0 mi) in length and 12.4 kilometres (7.7 mi) in width; it has an area of 73.15 km (28.24 sq mi). It has a population of 10,426 inhabitants.