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a mountain near the city of Thanh Hoa (Democratic Republic of Vietnam), on whose slopes the archaeologists Nguyen Dong Chi, Hoang Hung, and Le Van Lan discovered in 1960 the first ancient paleolithic site in Vietnam. In the course of investigations conducted from 1960 to 1968, more than 1,500 archaic Clactonian flakes were collected, as well as ten crude chopping tools (“choppers”), about 40 core tools, and several typical Chellean hand axes. The tools were made from local basalt. The Do materials closely resemble the materials found at Chellean sites in India, the Caucasus, Western Europe, and other regions.