South Korea most of which is not arable. Lowlands, located primarily in the west and southeast, make up only 30% of the total land area. About three thousand islands, mostly small and uninhabited, lie off the western and southern coasts of South Korea. Jeju-do is about off the southern coast of South Korea. It is the country's largest island, with an area of . Jeju is also the site of South Korea's highest point: Hallasan, an extinct volcano, reaches above sea level. The easternmost islands of South Korea include Ulleungdo and Liancourt Rocks (Dokdo/Takeshima), while Marado and Socotra Rock are the southernmost
Sousaki volcano Sousaki volcano Sousaki () is an extinct volcano and modern solfatara field in northeastern Corinthia, Greece, at the northwest end of the Aegean volcanic arc. The volcano was active 4.0 to 2.3 million years ago, during the Pliocene and early Quaternary periods of the Earth's geological history. There is still significant solfataric activity at this location. The volcano erupted dacite lava. The geothermal system releases about 1 megagram per day of gases at 42 °C, 90% CO and < 1% each of CH and HS. The earthquakes of 1997 of 3-4 R had as a result the uprising magma in