The 4th Friend Water Conference on the hydrology of the great rivers of Africa will take place in Cotonou (physically) and (visioconference) for those who will have travel constraints due to covid19 , from November 13 to 15, 2021 (for training) and from November 16 to 20, 2021 (for the conference). The peer review process for papers is still ongoing. The process of reviewing papers with reviewers is ongoing. However, all those who have submitted an abstract will present an oral presentation. Registration is still open and the date of the preferential rate has been extended to September 30, 2021. (To be continued…)