For 20 years the Boteti River in northern Botswana has not flowed. What was once an expansive and prolific body of water gradually dried up, leaving zebras, hippos, elephants and crocodiles dependant on the few pools formed from the occasional rains. 　　But now, for the first time in 30 years, rain has fallen in sufficient quantities hundreds of miles to the north in the Angolan highlands, sending a stream of water through the river bed. After years of extreme drought, the river has finally returned in all its glory, transforming the landscape. Filmed in stunning HD, Boteti The Returning River documents this extraordinary transformation and the dramatic changes it brings to the resident animals. 　　During the years of drought, we see how desperate battles for survival play out along the dormant river, watched over by the elephants of the area. One of the few species that adapts well to the situation by carefully conserving what little water is available, the elephant is an expert at digging ... 　　译文(3): 20年来，博茨瓦纳北部的Boteti河一直没有流过。曾经是一片广阔而多产的水域逐渐干涸，斑马、河马、大象和鳄鱼只能依靠偶尔下雨形成的少量水池。