Jeju Province, officially Jeju Special Self-Governing Province, is the southernmost province of South Korea, consisting of eight inhabited and 55 uninhabited islands, including Mara Island, Udo Island, the Chuja Archipelago, and the country's largest island, Jeju Island. The province is located in the Korea Strait, with the Korean Peninsula to the northwest, Japan to the east, and China to the west. The province has two cities: the capital Jeju City, on the northern half of the island and Seogwipo, on the southern half of the island. The island is home to the shield volcano Hallasan, the highest point in South Korea. Jeju and Korean are the official languages of the province, and the vast majority of residents are bilingual.
Sinan County is a county in South Jeolla Province, South Korea. The county consists of 111 inhabited islands and 719 uninhabited islands. The number of islands in this county accounts for 25% of all islands in South Korea.
Sado Island is an island located in the eastern part of the Sea of Japan, under the jurisdiction of Sado City, Niigata Prefecture, Japan, with a coastline of 262.7 kilometres (163.2 mi). In October 2017, Sado Island had a population of 55,212 people. Sado Island covers an area of 854.76 km2 (330.02 sq mi), and is the second largest island after Okinawa Island outside of the four main islands of Japan, excluding the disputed Southern Kurils. The shortest distance between Sado Island and Honshu is 32 km (20 mi). The highest peak on Sado Island is Mount Kinpoku, with an elevation of 1,172 m (3,845 ft).
Ulleungdo, also spelled Ulreungdo, is a South Korean island 120 kilometres east of the Korean Peninsula in the Sea of Japan, formerly known as Dagelet Island or Argonaut Island in Europe. 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 9.5 kilometres (6 mi) in length and ten kilometres (6 mi) in width; it has an area of 72.86 km2 (28.13 sq mi). It has a population of 10,426 inhabitants.
Hashima Island, commonly called Gunkanjima, is a tiny abandoned island off Nagasaki, lying about 15 kilometres from the centre of the city. It is one of 505 uninhabited islands in Nagasaki Prefecture. The island's most notable features are its abandoned concrete buildings, undisturbed except by nature, and the surrounding seawall. While the island is a symbol of the rapid industrialization of Japan, it is also a reminder of Japanese war crimes as a site of forced labour prior to and during World War II.
Taiping Island, also known as Itu Aba, and various other names, is the largest of the naturally occurring Spratly Islands in the South China Sea. The island is elliptical in shape being 1.4 kilometres (0.87 mi) in length and 0.4 kilometres (0.25 mi) in width, with an area of 46 hectares. It is located on the northern edge of the Tizard Bank. The runway of the Taiping Island Airport is easily the most prominent feature on the island, running its entire length.
Jeju Island is South Korea's largest island, covering an area of 1,833.2 km2 (707.8 sq mi), which is 1.83% of the total area of the country. Alongside outlying islands, it is part of Jeju Province.
Geojedo, or Geoje Island, is the principal island of Geoje, South Gyeongsang Province, South Korea. It is joined to land by two bridges from nearby Tongyeong. Gohyeon is the largest town on the island.
Baengnyeongdo, sometimes Baekryeong Island, is an island in Ongjin County, Incheon, South Korea. It is an inhabited island located near the Northern Limit Line, and is closer to North Korea than it is to the South.
Marado (Korean: 마라도) or Mara Island is an island in Jeju Province, South Korea. It is South Korea's southernmost island, and is 8 km (5.0 mi) off the south coast of Jeju Island.
Yeouido is a large island on the Han River in Seoul, South Korea. It is Seoul's main finance and investment banking district. It is 8.4 square kilometres (3.2 sq mi) large and has a population of 32,674 as of August 2023.
Deokjeokdo (Korean: 덕적도) or Deokjeok Island is the largest island of Deokjeok-myeon, Ongjin County, Incheon, South Korea.
Muuido, also known as Muui Island, is an island in Incheon, South Korea. It is a small island located south of Yongyu Island, which was joined with Yeongjong Island through land reclamation when Incheon International Airport was built.
Sindo, also known as Jinyeom, is an island in Sindo-ri, Bukdo-myeon, Ongjin County, Incheon, South Korea.
Ui-dong is a dong, neighbourhood of Gangbuk-gu in Seoul, South Korea. From June 30 of 2008, Former Suyu-4 dong is changed to the administrative dong. Thus Ui-dong can be called either legal dong or administrative dong.
The Liancourt Rocks dispute, also called the Takeshima dispute or Dokdo dispute is a territorial dispute between South Korea and Japan regarding sovereignty over the Liancourt Rocks, a group of small islets in the Sea of Japan. The rocks also go by the names Dokdo and Takeshima. North Korea also claims sovereignty of the islands, but has not pursued its claim to the same extent as the other parties.
Udo, also known as U Island and sometimes Soseom (소섬), is an island in Jeju Province, South Korea. It is 2.8 km (1.7 mi) off the coast of Jeju Island, and is the second-largest island in the province.
Oido is an area in Siheung, Gyeonggi Province, South Korea. As its name suggests, it was previously an island, but land reclamation projects in the 20th century led to it eventually joining the mainland.
Biyangdo is an island in Jeju City, Jeju Province, South Korea.
