page_title: Jeju Island
section_title: Geography
hierarchical_section_title: Jeju Island / Geography
caption_attribution_description: English: The cliff was consist of hexagonal stone pillars which made from lava that was cooled fast when it arrived at the sea
context_page_description: Jeju Island is the largest island in South Korea, located in the Jeju Province. The island lies in the Korea Strait, below the Korean Peninsula, south of the South Jeolla Province. The island contains the natural world heritage site, Jeju Volcanic Island and Lava Tubes. Jeju has a moderate climate; even in winter, the temperature rarely falls below 0 °C. Jeju is a popular holiday destination and a sizable portion of the economy relies on tourism and economic activity from its civil/naval base.
context_section_description: Jeju is a volcanic island, dominated by Hallasan: a volcano 1,950 metres (6,400 ft) high and the highest mountain in South Korea. The island measures approximately 73 kilometres (45 mi) across, east to west, and 41 kilometres (25 mi) from north to south.
  The island formed by volcanic eruptions approximately 2 million years ago, during the Cenozoic era. The island consists chiefly of basalt and lava.
  An area covering about 12% (224 square kilometres or 86 square miles) of Jejudo is known as Gotjawal Forest. This area remained uncultivated until the 21st century, as its base of 'a'a lava made it difficult to develop for agriculture. Because this forest remained pristine for so long, it has a unique ecology.
  The forest is the main source of groundwater and thus the main water source for the half million people of the island, because rainwater penetrates directly into the aquifer through the cracks of the 'a'a lava under the forest. Gotjawal forest is considered an internationally important wetland under the Ramsar Convention by some researchers because it is the habitat of unique species of plants and is the main source of water for the residents, although to date it has not been declared a Ramsar site.
caption: Daepo Jusangjeolli Cliff
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