Paektu Mountain

Paektu Mountain or Baekdu Mountain is an active stratovolcano on the Chinese–North Korean border. In China, it is known as Changbai Mountain. At 2,750 m, it is the tallest mountain in North Korea and Northeast China and the tallest mountain of the Baekdu-daegan and Changbai mountain ranges. The highest peak, called Janggun Peak, belongs to North Korea. The mountain notably has a caldera that contains a large crater lake called Heaven Lake, and is also the source of the Songhua, Tumen, and Yalu rivers. Korean and Manchu people assign a mythical quality to the mountain and its lake, and consider the mountain to be their ancestral homeland.

The mountain's caldera was formed by an eruption in 946 that released about 100–120 km3 of tephra. The eruption was among the largest and most powerful eruptions on Earth in the last 5,000 years.