Promess 1 was the first scientific drilling operation in the Gulf of Lions. Together with Eurostrataform, these 2 European projects provided a huge amount of new data that allows us to analyse, from « sink to source », the main processes that control strata architecture on a deltaic margin. In the deep-sea, The Rhone deep sea fan functioning is strongly controlled by sea-level changes: it functions as a classical channel/levee system as long as a direct connection exists between the Rhone river and the canyon head. Following MWP1A, only episodic mass wasting, triggered by dense water cascading, feeds the system. At this time, erosion of lowstand shelf shorefaces is the major source of sand to the deep-sea. [NOT CONTROLLED OCR]