When seasonal rains sweep across South America, the Amazon River and its tributaries overflow their banks to create an ecosystem unlike any other - a place where, for six months out of each year, land-dwellers and water-dwellers mingle. This program joins an expert Amazon biologist in a journey into the flooded forests of the Amazon Basin to film dolphins navigating through treetops, a male 'water monkey' releasing a cloud of babies from the nest in its mouth, and the usually lethargic three-toed sloth swimming agilely among branches. The video also explores the depletion of the region's natural resources, both by indigenous inhabitants struggling to survive and by outsiders eager to clear land for mass crop production.