Underground Primitive Forest of Changbai Mountain

China.org.cn, November 9, 2016
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The underground primitive forest, also called valley floor forest, is located in the north scenic area of the Changbai Mountain. When the volcano erupted, the volcano cone broke and collapsed, forming a valley of 50 meters deep and about 3,000 meters long from north to south. There are tall ancient trees and huge rocks at the bottom of the valley, making it a natural oxygen bar.