In November 2001, a Vietnamese-French team undertook the excavation of the Ma U’Oi cave in northern Vietnam. This limestone karst cave is located in the province of Hoà Binh, 70 km ESE from Hanoi and is typical of the northern Vietnam landscape. The site yielded an in situ mammalian fauna of a relatively modern composition. We also found a mixed fauna with a lower molar attributed to an archaic Homo (Demeter et al., in press). We estimate the age of Ma U’Oi fauna between 169 kyr, the age of Thum Wiman Nakin (Esposito et al., 1998) estimated by U/Th method and 80-60 kyr, the biochronological age of Lang Trang (Long et al., 1996), or even Holocene. The Ma U’Oi site is important because of the scarcity of Vietnamese sites of those particular levels. For that reason, it fills a gap in the biostratigraphy of Vietnam and permits new correlations with other sites of the mainland, especially those well documented from Thailand.