Our project aims to develop and strengthen audacious and innovative mathematical collaborations in Arithmetic and Geometry with Central Africa, and to train a new generation of researchers in this region who will then act as a lever to train the next generations. It involves researchers, postdocs, and PhD students from Africa, as well as Western researchers, all of whom are internationally-recognized experts. This project is built upon our previous investment in Africa and aims to have a major impact. A large part of our recent activities take place in the École Normale Supérieure de Libreville in Gabon.