A team of scientists, experts in river ecology, undertake crucial research into a key environmental crisis of our time: the salinization of the planet’s freshwaters. Throughout their journey along the River Gambia, they study the impact of this phenomenon on this socio-ecosystem, from the effects on biodiversity to changes in biogeochemical processes. They also evaluate the relationship of riverside communities with the river and how they are affected by salinization. This journey immerses us in the epicenter of a relentlessly advancing threat while searching for solutions and adaptation strategies to protect the future of this river.