RIVERS RUN THROUGH HUMANITY’S STORIES in many guises. They are boundaries and passageways, homecomings and leave-takings, life as well as death. For Wade Davis, the explorer, writer, scientist and anthropology professor, the river that is the metaphor for all the others is Colombia’s mighty Magdalena and, to him, it is nothing short of redemption.
It’s a lot to put on a river. But Davis, 66, came of age on Magdalena’s banks. He first set foot in Colombia as a Montreal schoolboy of 14 and, enchanted, took a one-way ticket back six years later to parse the nation’s secrets. Now, as an elder, he has finally surrendered to the seductions of the river. He can see not just what it once meant to its people but also what it could mean.…