Jeju-island(濟州島, Jeju-do) is an island located in the South Sea of South Korea and the largest island in South Korea's largest island. In addition, Jeju Island belongs to Jeju Special Self-Governing Province in the administrative district. The area of the island is 1833.2 km인데, or 1.83% of the area in South Korea. The resident registration population in 2020 is about 670,000, the largest among the islands in Korea.
Jeju Island also has a gentle slope centered on Hallasan Mountain in the center, with an oval shape of 73 km east and 31 km north and west. The road is 181 kilometers long and 258 kilometers along the coast. The northern end of Jeju Island is Gimnyeong Beach, the southern end is Songaksan Mountain, the western end is Suwolbong Peak, and the eastern end is Seongsan Ilchulbong Peak. Jeju Island has a temperate climate, and it stays almost below zero even in winter. It's the Yellow Sea and East China Sea, East Sea border South Korea's economic and political as well as in military also an important position.
Jeju Island was also designated as a biosphere conservation zone by UNESCO on December 16, 2002, recognizing the ecological value of climate and biodiversity. In addition to Gapado Island, Hallasan Mountain, Seongsan Ilchulbong Peak, Geomunoreum Lava Cave was registered as a World Heritage Site in June 2007 in recognition of the value and importance of academic, cultural, tourism, and ecology. On October 3, 2010, UNESCO World Geopark Network (GGN) certified the World Geopark in Jeju Island.