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In page Geography of South Korea:

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South Korea is largely mountainous, with 3/4 of its landmass consisting of mountains.[1] 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.[citation needed] Many tall mountains exceeding 1,000 m (3,281 ft), which are concentrated in the north and the east, form the "topological backbone" of the country.[1] There are two major mountain ranges within South Korea: the Taebaek Mountains, and the Sobaek Mountains. 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. Geologically, Precambrian rocks such as granite make up the landmass.[2]