The Amazon is the mightiest of all the rivers, but it is also under immense pressure. Jeremy Wade traces the epic migration of the dorado catfish and discovers the issues putting this great river at risk from leaking pipelines to impassable dams.

亚马逊河是所有河流中最强大的河流，但它也承受着巨大的压力。杰里米·韦德追踪了多拉多鲶鱼的大规模迁徙，发现了使这条大河面临危险的问题——从管道泄漏到无法通行的水坝。