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Thung Mountain is located in the scenic complex of Thang Hen Lake with a system of 36 interconnected lakes in 2 communes: Cao Chuong, Trung Khanh district and Quoc Toan, Quang Hoa district (Cao Bang). Surrounded by undulating rocky mountains and winding streams, creating a majestic beauty. According to scientists, Mat Than Nui is actually a dry cave, a fossil cave formed more than 300 million years ago. The cave is located at its current height due to uplift during the neotectonic period, including tower-shaped and cone-shaped mountain blocks interwoven with dozens of large and small lakes.