Geography of South Korea

Satellite image of South Korea.

The Korean Peninsula extends southward from the northeast part of the Asian continental landmass. The Japanese islands of Honshū and Kyūshū are located some 200  km (124  mi) to the southeast across the Korea Strait; the Shandong Peninsula of China lies 190 kilometers to the west. The west coast of the peninsula is bordered by the Korea Bay to the north and the Yellow Sea and Korea Strait to the south; the east coast is bordered by the Sea of Japan. The 8,640-kilometer coastline is highly indented. Some 3,579 islands lie adjacent to the peninsula. Most of them are found along the south and west coasts.

The line between the two Korean states was the thirty-eighth parallel of latitude. After the Korean War, the Korean Demilitarized Zone (DMZ) formed the boundary between the two. The DMZ is a heavily guarded, 4,000-meter-wide strip of land that runs along the demarcation line established by the Korean Armistice Agreement from the east to the west coasts for a distance of 241 kilometers (238 kilometers of that line from the land boundary with North Korea).

The total land area of the peninsula, including the islands, is 223,170 square kilometers. Some 44.8 percent (100 210 square kilometers) of this total, excluding the area within the DMZ, constitutes the territory of the Republic of Korea. The combined territories of North Korea and South Korea are about the same size as the U.S. state of Minnesota. South Korea alone is about the size of Portugal or Hungary, or the U.S. state of Indiana.[2]

The largest island, Jeju-do, lies off the southwest corner of the peninsula and has a land area of 1,825 square kilometers. Other important islands include Ulleung and Liancourt Rocks in the Sea of Japan and Ganghwa Island at the mouth of the Han River. Although the eastern coastline of South Korea is generally unindented, the southern and western coasts are jagged and irregular. The difference is caused by the fact that the eastern coast is gradually rising, while the southern and western coasts are subsiding.

Topography of South Korea

Earthquake epicenter map in South Korea from Jan 2000 (M2.0 or higher).

Early European visitors to Korea remarked that the land resembled "a sea in a heavy gale" because of the large number of successive mountain ranges that crisscross the peninsula. The highest mountains are in North Korea. The highest mountain peak in South Korea is Hallasan (1,950 m (6,398 ft)), which is the cone of a volcanic formation constituting Jeju Island. There are two major mountain ranges within South Korea: the Taebaek Mountains, and the Sobaek Mountains.

Unlike Japan or the northern provinces of China, the Korean Peninsula is geologically stable. There are no active volcanoes (aside from Baekdu Mountain on the border between North Korea and China, most recently active in 1903), and there have been no strong earthquakes. Historical records, however, describe volcanic activity on Mount Halla during the Goryeo Dynasty (918–1392).

South Korea has no extensive plains; its lowlands are the product of mountain erosion. Approximately 30 percent of the area of South Korea consists of lowlands, with the rest consisting of uplands and mountains. The great majority of the lowland area lies along the coasts, particularly the west coast, and along the major rivers. The most important lowlands are the Han River plain around Seoul, the Pyeongtaek coastal plain southwest of Seoul, the Geum River basin, the Nakdong River basin, and the Yeongsan River and the Honam plains in the southwest. A narrow littoral plain extends along the east coast.

The Nakdong is South Korea's longest river (521 km (324 mi)). The Han River, which flows through Seoul, is 514 km (319 mi) long, and the Geum River is 401 km (249 mi) long. Other major rivers include the Imjin, which flows through both North Korea and South Korea and forms an estuary with the Han River; the Bukhan, a tributary of the Han that also flows out of North Korea; and the Somjin. The major rivers flow north to south or east to west and empty into the Yellow Sea or the Korea Strait. They tend to be broad and shallow and to have wide seasonal variations in water flow.

In the early part of the 20th century and especially the period during and after World War II and the Korean War, much of the existing Korean forests were cut down, which led to problems with flooding and soil erosion. Combination of reforestation efforts (e.g. Arbor day was celebrated as a national holiday starting in 1949) and policies designed to reduce the use of firewood as a source of energy (e.g. restriction of inflow of firewood into Seoul and other major cities starting in 1958) helped to spark a recovery in the 1950s.[3] Comprehensive reforestation programs starting in the 1970s and continuing into the late 1990s aided in an acceleration of forest volume increase,[4] and the forest cover reached a peak of 65% of national land area in 1980 as opposed to a low of 35% in 1955.[3]

News that North Korea was constructing a huge multipurpose dam at the base of Geumgangsan (1,638 m (5,374 ft)) north of the DMZ caused considerable consternation in South Korea during the mid-1980s. South Korean authorities feared that once completed, a sudden release of the dam's waters into the Pukhan River during north–south hostilities could flood Seoul and paralyze the capital region. During 1987 the Geumgangsan Dam was a major issue that Seoul sought to raise in talks with Pyongyang. Though Seoul completed a "Peace Dam" on the Pukhan River to counteract the potential threat of Pyongyang's dam project before the 1988 Olympics, the North Korean project still was in its initial stages of construction in 1990.

Maritime claims:
territorial sea: 12 nmi (22.2 km; 13.8 mi); between 3 nmi (5.6 km; 3.5 mi) and 12 nmi (22.2 km; 13.8 mi) in the Korea Strait
contiguous zone: 24 nmi (44.4 km; 27.6 mi)
exclusive economic zone: 200 nmi (370.4 km; 230.2 mi)
continental shelf: not specified

Elevation extremes:
lowest point: Sea level 0 m
highest point: Hallasan 1,950 m (6,398 ft)

Köppen climate types of South Korea

Satellite image of Korean Peninsula on 3 January 2010, before a record snowfall since 1937 in Seoul area

Part of the East Asian Monsoon region, South Korea has a temperate climate with four distinct seasons. The movement of air masses from the Asian continent exerts a greater influence on South Korea's weather than does air movement from the Pacific Ocean. Winters are usually long, cold, and dry, whereas summers are short, hot, and humid. Spring and autumn are pleasant but short in duration. Seoul's mean temperature in January is −5 to −2.5 °C (23.0 to 27.5 °F); in July the mean temperature is about 22.5 to 25 °C (72.5 to 77.0 °F). Because of its southern and seagirt location, Jeju Island has warmer and milder weather than other parts of South Korea. Mean temperatures on Jeju range from 2.5 °C (36.5 °F) in January to 25 °C (77 °F) in July.

The country generally has sufficient rainfall to sustain its agriculture. Rarely does less than 750 millimeters (29.5 in) of rainfall in any given year; for the most part, rainfall is over 1,000 millimeters (39.4 in). Amounts of precipitation, however, can vary from year to year. Serious droughts occur about once every eight years, especially in the rice-producing southwestern part of the country. About two-thirds of the annual precipitation occurs between June and September.

South Korea is less vulnerable to typhoons than Japan, Taiwan, the east coast of China, or the Philippines. From one to three typhoons can be expected per year. Typhoons usually pass over South Korea in late summer, especially in August, and bring torrential rains. Flooding occasionally causes considerable damage, as do landslides, given the country's generally mountainous terrain.

In September 1984, record floods caused the deaths of 190 people and left 200,000 homeless. This disaster prompted the North Korean government to make an unprecedented offer of humanitarian aid in the form of rice, medicine, clothes, and building materials. South Korea accepted these items and distributed them to flood victims.[5]

Graphically the seasons can be represented this way:

Natural resources

South Korea produces coal, tungsten, graphite, molybdenum, lead, and has potential for hydropower.

Land use

[7]

Arable land: 15.3%

Permanent crops: 2.2%

Permanent pasture: 0.6%

Forest: 63.9%

Other: 18.0%

Irrigated land

[8]

8,804 km²

Total renewable water resources

69.7 km³

Freshwater withdrawal (domestic/industrial/agricultural)[8]

Total: 25.47 km³/yr (26%/12%/62%)

Per capita: 548.7 m³/yr

•  This article incorporates public domain material from the CIA World Factbook website https://www.cia.gov/the-world-factbook/.

• Andrea Matles Savada (1997). South Korea: A Country Study, Honolulu

• Extreme points of South Korea
• List of national parks of South Korea
• List of islands of Korea
• List of lakes of Korea
• List of rivers of Korea
• List of mountains in Korea
• Geography of North Korea
• List of Korea-related topics