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
Emperor of China (volcano) have been defined as extinct based on their structural settings and their age, which is stated that the volcanic activity was estimated stopped after 7 Ma ago. The end of magmatic activity in the NEC ridge at 3 Ma is thought of as the result from the collision of Timor and the Wetar segment of the Sunda Arc. Emperor of China (volcano) Emperor of China is a submarine volcano in the western part of the Banda Sea, Indonesia. This volcano is part of a chain with Nieuwerkerk volcano, known scientifically as the "Emperor of China–Nieuwkerk" (NEC) ridge, the depth of