KOREA or COREA (CH’AO HSIEN, DAI HAN).
Its mainland portion consists of a peninsula stretching southwards from Manchuria, with an estimated length of about 600 m., an extreme breadth of 135 m., and a coast-line of 17 4 0 m. It extends from 34° 18′ to 43° N., and from 124° 36′ to 130 47′ E. Its northern boundary is marked by the Tumen and Yalu rivers; the eastern boundary by the Sea of Japan; the southern boundary by Korea Strait; and the western boundary by the Yalu and the Yellow Sea.
For 11 m. along the Tumen river the north frontier is conterminous with Russia (Siberia); otherwise Korea has China (Manchuria) on its land frontier. Nearly the whole surface of the country is mountainous.

1911 Encyclopædia Britannica eleventh edition, Volume 15.