The Hamgyong Mountains (Korean: 함경산맥, 咸鏡山脈, Hamgyeong Sanmaek), officially known as the Gangbaekjeonggan and formerly known as the Pepi Shan or Tumen Mountains, is a North Korean mountain range. It lies in the northeast quarter of the country, extending for about 350 kilometers (220 mi) southwest and northeast parallel to the Sea of Japan (Korea's "East Sea"). Its northern terminus is in the Tumen Valley. To its west are the Kaema Highlands.
Overall, the Hamgyongs are the highest range of mountains on the peninsula. The tallest mountain in the range is Kwanmo Peak (2,540 m), the second-highest after Paektu (China's "Changbai"). Other notable peaks include Du Peak (2,396 m), Gwesang Peak (2,333 m) and Mount Dury (2,303 m). In total, ten major peaks and 62 subsidiary peaks of the mountains in this range are 2,000 m or higher.
- "Corea", Encyclopædia Britannica, 9th ed., Vol. VI, New York: Charles Scribner's Sons, 1878, pp. 390–394.
- "Hamgyŏng Mountains", Encyclopædia Britannica Online, New York: Encyclopaedia Britannica, 2011.
- World and Its Peoples: Eastern and Southern Asia, Marshall Cavendish, 2007, ISBN 0761476318.
- Yŏnhap Tʻongsin (2003), "North Hamgyeong Province", North Korea Handbook, M. E. Sharpe, ISBN 0765610043.
- Zaichikov, V.T. (1952), Geography of Korea, International Secretariat of the Institute of Pacific Relations.
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