injection points

Where do rivers start? That’s a question that has always fascinated me, basically because I know that the Nile, the Amazon and the Thames – as majestic and life-giving as they and many of the world’s other great rivers become – all begin as mere trickles. Indeed, with the notable exception of rivers that erupt from the ground as powerful streams, most great rivers start out as subtle emanations of water that has migrated, globule by globule, through vast areas of porous rock to emerge as tiny rivulets in zones known as “spring lines.”  These spaces typically exist between