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Jeju Island

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Jeju Island is the largest island in South Korea.

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It covers 1,850 square kilometers. This area represents 1.83% of the total area of South Korea. The island sits in the Korea Strait. It is located south of the Korean Peninsula. Jeju is part of Jeju Province. It makes up most of that province. The island has an oval shape. It stretches both east-to-west and north-to-south. The landscape features a gentle slope around a central mountain. This mountain is Hallasan. It is the highest peak in South Korea.

The island formed through volcanic activity. This process began approximately 2 million years ago. It started with a submarine volcano. About 1.2 million years ago, a magma chamber formed under the sea floor. This chamber began to erupt. Volcanic activity continued about 700,000 years ago. Then, the activity stopped for about 100,000 years. Around 300,000 years ago, eruptions restarted along the coastline. About 100,000 years ago, Hallasan Mountain was formed. Roughly 25,000 years ago, lateral eruptions occurred around the mountain. These eruptions created many oreum. An oreum is a small extinct volcano or parasitic cone. There are about 360 oreum on the island. These include Geomunoreum, Yongnuni Oreum, and Geum Oreum.

Jeju has a unique landscape made of basalt and lava. About 12% of the island is called gotjawal. This is a local term for forests. These forests grew on a base of 'a'a lava. This type of lava is very rocky. Because of this, the land was difficult to use for farming. The forests remained uncultivated until the 21st century. This allowed them to stay pristine. These forests are very important for the ecosystem. They are the main source of groundwater for the island. Rainwater penetrates the cracks in the 'a'a lava. The water then fills an aquifer. This provides fresh water for the 500,000 people living there.

Humans have lived on the island since the early Neolithic period. Historically, Jeju was an independent kingdom. It was called Tamna, which means "island country." It remained independent until 938 AD. At that time, it became a vassal state of the Goryeo dynasty. In 1404, the Joseon dynasty brought the island under central control. A legend tells of the three divine founders of Tamna. These founders were Go, Yang, and Bu. They supposedly emerged from three holes in the ground. These holes are called Samseonghyeol. They are still preserved in Jeju City today.

The island has been known by many different names. Europeans often called it Quelpart. This name may come from a French word. It might refer to a Dutch ship called the quelpaert de Brack. This ship was a small dispatch vessel. Portuguese explorers called it Ilha de Ladrones. This means "Island of Thieves." In 1910, Japan annexed the island. During the occupation, it was known as Saishū. The Jeju language is still spoken by indigenous people. However, UNESCO considers it critically endangered. Shamanism also remains very intact on the island.

Jeju has a humid subtropical climate. There are four distinct seasons. Summers are hot and humid with high rainfall. Winters are cool with moderate rainfall. The geography affects the weather. Hallasan Mountain blocks continental seasonal winds. This makes the southern part, Seogwipo, warmer in winter. Seogwipo has the highest average January temperature in Korea. The northern part, Jeju City, is colder in winter. The highlands near Hallasan are different. As altitude increases, the temperature decreases. These highlands have the highest annual precipitation in Korea. In 2016, a cold wave hit the island. It cancelled 1,200 flights. This stranded about 90,300 passengers.

Many unique species live on the island. Many plants and animals have scientific names that link them to Jeju. For example, the spider Atypus quelpartensis lives there. The ant Camponotus jejuensis is also found on the island. Some species are found nowhere else. The island is also a major holiday destination. A large part of the economy relies on tourism. The island is home to a natural World Heritage Site. This site is called the Jeju Volcanic Island and Lava Tubes.

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