Paektu
Mount Paektu or Mount Baekdu is an active volcano on the border between North Korea and China. At 2,744 m (9,003 ft), it is the highest mountain of the Changbai and Baekdudaegan ranges. North and South Koreans consider the volcano and its caldera lake to be their countries' spiritual home.
It is also the highest mountain on the Korean Peninsula and in Northeast China. A large crater lake, called Heaven Lake, is in the caldera atop the mountain. The caldera was formed by the VEI 7 "Millennium" or "Tianchi" eruption of 946, which erupted about 100–120 km3 (24–29 cu mi) of tephra. This was one of the largest and most violent eruptions in the last 5,000 years (alongside the Hatepe eruption of Lake Taupo in around AD 180 and the 1815 eruption of Tambora).
The modern names of the mountain in Chinese and Korean come from the Sushen or Proto-Jurchen language of the Manchu peoples. Its modern Manchu name is Golmin Šanggiyan Alin or Long/Ever White Mountain. Similarly, its Mongolian name is Ondor Tsagaan Aula, the Lofty White Mountain. This name later, read in Korean and variously romanized, is the source of the North Korean name Paektu-san and South Korean Baekdu-san. In English, various authors have used non-standard transliterations.
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