Victoria Falls – or Mosi-oa-Tunya, meaning “smoke that thunders” in the local Tonga langue – has been called one of the seven natural wonders of the world. Over 100 meters in height, it sits on the border between Zambia and Zimbabwe. Its incredible power is harnessed to provide electricity for both countries. But in recent years drought has seen water levels drop in the Zambezi River that supplies the falls. That’s meant electricity production has fallen, too.