Geologically, South Korea consists in large part of Precambrian rocks (i.e., more than about 540 million years old) such as granite and gneiss. The country is largely mountainous, with small valleys and narrow coastal plains. The T’aebaek Mountains run in roughly a north-south direction along the eastern coastline and northward into North Korea, forming the country’s drainage divide. From them several mountain ranges branch off with a northeast-southwest orientation. The most important of these are the Sobaek Mountains, which undulate in a long S-shape across the peninsula. None of South Korea’s mountains are very high: the T’aebaek Mountains reach an elevation of 5,604 feet (1,708 metres) at Mount Sŏrak in the northeast, and the Sobaek Mountains reach 6,283 feet (1,915 metres) at Mount Chiri. The highest peak in South Korea, the extinct volcano Mount Hallaon Cheju Island, is 6,398 feet (1,950 metres) above sea level(Britannica,2021).
South Korea has two volcanic islands—Cheju (Jeju), off the peninsula’s southern tip, and Ullŭng, about 85 miles (140 km) east of the mainland in the East Sea—and a small-scale lava plateau in Kangwŏn province. In addition, South Korea claims and occupies a group of rocky islets—known variously as Liancourt Rocks, Tok (Dok) Islands (Korean), and Take Islands (Japanese)—some 55 miles (85 km) southeast of Ullŭng Island; these islets also have been claimed by Japan(Britannica,2021).
South Korea’s three principal rivers, the Han, Kŭm, and Naktong, all have their sources in the T’aebaek Mountains, and they flow between the ranges before entering their lowland plains. Nearly all the country’s rivers flow westward or southward into either the Yellow Sea or the East China Sea; only a few short, swift rivers drain eastward from the T’aebaek Mountains. The Naktong River, South Korea’s longest, runs southward for 325 miles (523 km) to the Korea Strait. Streamflow is highly variable, being greatest during the wet summer months and considerably less in the relatively dry winter(Britannica,2021).
Fatoumata Cisse
