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The Jeju Volcanic Island and Lava Tubes is a World Heritage Site in South Korea.〔(【引用サイトリンク】 Natural sites in Madagascar, China and Korea inscribed on UNESCO World Heritage List )〕 Jeju, also known as Jejudo, is a volcanic island, 130 kilometers from the southern coast of the Korean Peninsula. The largest island and smallest province in South Korea, the island has a surface area of 1,846 square kilometers.〔(【引用サイトリンク】 work = ) Geography of Jeju〕 It is listed at number 23 on CNN Go's ''50 natural wonders: The ultimate list of scenic splendor''.〔CNN Go (50 natural wonders: The ultimate list of scenic splendor ) 1 November 2011. Retrieved 2011-11-03〕 ==Formations== A central feature of Jeju is Hallasan, the tallest mountain in South Korea and a dormant volcano, which rises 1,950 meters above sea level. The main volcano includes 360 satellite volcanoes. Volcanic activity on Jeju began approximately in the Cretaceous and lasted until the early Tertiary period. The most recent eruptions are estimated to be be about 5,000 years ago, which puts the volcano into the active classification, meaning eruptions in the last 10,000 years. The designation as active is not agreed by all, as more monitoring and study are needed to better understand the volcano.〔 The island is covered in volcanic rock and volcanic soil produced by Hallasan. Baengnokdam, the crater, and lake in it are located at the peak of Hallasan, which was formed over 25,000 years ago. Jeju is scientifically valuable for its extensive system of lava tubes (also known as lateral volcanoes or in Korean as ''Oreum''). These natural conduits through which magma once flowed are now empty caves that are some of the largest in the world. The caves provide opportunities for scientific research and are also popular tourist destinations. Off the shores of the city of Seogwipo are a vast belt of pillar-shaped rocks that are examples of the natural beauty of Jeju. Shellfish and animal fossils discovered in this area are also very valuable as scientific resources. Beom Island (Beomseom 범섬, sometimes still misspelled Pomsom) and Mun Island (Munseom 문섬, sometimes spelled Munsom), also off the city seacoast, are also well preserved and scenic areas. The variety of animal and plant species on Jeju is also an important reason for its value as a natural reserve. Half of all Korean vascular plants grow naturally on the island while another 200 species of plants indigenous to Korea have been transported here. However, half of these species face extinction. The polar plants which came from the south during a glacial period and inhabit the peak of Jeju is one example. Other plants in the subtropical forest and lower regions of the island are also endangered. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jeju Volcanic Island and Lava Tubes」の詳細全文を読む スポンサード リンク
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