International audienceOver the past thirty years, the Hauts-de-France region has produced a significant number of Neanderthal occupations attributed to the Middle Palaeolithic, correlated with the end of the Middle Pleistocene and the beginning of the Upper Pleistocene. Despite these numerous discoveries, the Eemian - the last Interglacial (129-116 ka) - remains a little-known period on the palaeoenvironmental and anthropological level, an assessment valid for the northern half of France but also for the whole of North-western Europe, and more broadly for Western Europe. In this paper, we retrace the history of the discovery of a new, hitherto unknown, Eemian formation at Waziers (Nord). It takes on particular importance due to the good pre...