Cliff art reveals the majesty of the Amazon’s aquatic realm

These pictographs in Colombia’s Chiribiquete National Park, tens of thousands of years old, are evidence of humankind’s long relationship with the world’s greatest freshwater ecosystem. I’m part of the National Geographic and Rolex Perpetual Planet Amazon Expedition, working closely with other National Geographic Explorers doing critical research in the hope of securing the future of this watery realm, which has been neglected by science and the media.