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
Kaena Point with surfers of other North Shore locations. Kaena Point is located in a remote area with no direct paved road access and no rescue capabilities. Additionally, the point's geography results in undertows, dangerous rip currents and other hazardous ocean conditions that make any water activity highly dangerous. Ka'ena used to be an active shield volcano that formed about 15% of the island. It is also 5 million years old, making it the oldest volcano on Oahu. Ka'ena must have suffered a large collapse because of its large crater. When it became extinct, which was about 4.2 million years ago, it