Stretched in green and gold glory as far as the eye can see, the African bush has a primal allure that takes your breath away. The Okavango Delta in Botswana adds blue to the canvas, with tranquil waterways reflecting the sky. Herds of elephants splash their way towards grassy islands, and sunsets can be paddled into, rippling like satin. An oasis in an otherwise arid country, the Okavango is an inland delta recognised as a Unesco World Heritage site. Every year from March to August about 11 cubic kilometres of water spreads over a 15,000 sq km area, drawing one of Africa's greatest concentrations of wildlife.