Imagine a pointing index finger, more than 500 kilometres long and 32 kilometres wide. This giant digit is attached to a huge fist, a landmass punctuated with soaring sand dunes and oceans of desert. Surround the finger with rivers— the mighty Zambezi, the Chobe, Linyanti—and you have the Zambezi Region, a water-rich extremity shooting from the north-eastern corner of Namibia like an arrow into the heart of Africa