Jeju Island

- _This article is about the island itself.  For the province, see Jeju-do.  For the World Heritage Site, see Jeju Volcanic Island and Lava Tubes._
**Jejudo** (also known as **Jeju Island**) is the largest island off the coast of the Korean Peninsula. It is the main island of Jeju Province of South Korea.  The island lies in the Korea Strait, southwest of South Jeolla Province. The island contains the natural World Heritage Site Jeju Volcanic Island and Lava Tubes. The highest point in South Korea is the Island's dormant volcano, Hallasan, which stands  above sea level. Jejudo has a temperate climate. Even in winter, the temperature rarely falls below . The Island is a popular place for Korean newlyweds to honeymoon.

Jeju Island is 73 km wide from east to west and 31 km wide from north to south.  Most of Jeju Island is made out of volcanic rocks from the Holocene era.

First, the basalt lava erupted to make the Hallasan shield volcano about 2 million years ago.  Hallasan was still active into recorded history, but it is not active now.  Then this first layer of volcanic rock was covered up with sediment.  Then there was another set of eruptions, which made most of the rock on the surface of Jeju Island today.  In the third round of volcanic activity, Hallasan grew to its current, tall height, 1950 m.

## Infobox (settlement)

- **native name lang**: ko
- **settlement type**: Provinces of South Korea, Special Self-Governing Province
- **translit lang1**: Korean
- **translit lang1 type**: Hangul
- **image skyline**: Jeju Island montage.png
- **image flag**: Flag of Jeju Province (1969–2009).svg
- **image map**: Jeju Province in South Korea.svg
- **subdivision type**: Country
- **subdivision name**: South Korea
- **subdivision type1**: Region
- **subdivision name1**: Jeju
- **seat type**: List of capitals in South Korea, Capital
- **seat**: Jeju City
- **parts type**: Subdivisions
- **parts**: 2 cities; 0 counties
- **leader title**: Governor
- **leader name**: Won Hee-ryong
- **leader party**: Independent politician, Independent
- **leader title1**: Body
- **leader name1**: Jeju Provincial Council
- **leader title2**: National Representation
 - National Assembly of South Korea, National Assembly
- **leader name2**: 1.19% (constituency seats)
- **area total km2**: 1,849
- **area rank**: 9th
- **population total**: 604,771
- **population as of**: October, 2014
- **population density km2**: 327.1
- **population rank**: 9th
- **demographics type1**: Metropolitan Symbols
- **demographics1 title1**: Flower
- **postal code**: 690-000~699-999
- **area code**: +82-64-7xx
- **blank name sec1**: Dialect
- **blank info sec1**: Jeju dialect, Jeju
- **website**: [http://english.jeju.go.kr/ Official Website]
- **translit lang1 type1**: Hanja
- **translit lang1 type2**: McCune‑Reischauer
- **translit lang1 info2**: Cheju T'ŭkpyŏl Chach'ido
- **translit lang1 type3**: Revised Romanization
- **translit lang1 info3**: Jeju Teukbyeoljachi-do
- **demographics1 info1**: Rhododendron
- **demographics1 title2**: Tree
- **demographics1 info2**: Cinnamomum camphora
- **demographics1 title3**: Bird
- **demographics1 info3**: Woodpecker
- **demographics1 title4**: Jeju
- **blank name sec2**: Human Development Index, HDI (2017)
- **blank info sec2**: 0.888


## Infobox (korean name)

- **hangul**: 제주도
- **hanja**: 濟州島
- **rr**: Jejudo
- **mr**: Chejudo