The Okavango Delta is the largest inland delta in the world, and instead of flowing into the sea, the annual flood of fresh water flows inland, spreading over 15,000km of the Kalahari sand in a maze of lagoons and channels. The delta forms part of the Kalahari Basin, situated at the southern periphery of the Great Rift Valley and covers an area of 22,000 square kilometres. This is home to an estimated 9,000 species of flora and fauna – as such the delta is widely regarded as one of the premium destinations for game viewing. Although the periphery is semi-arid, the delta itself is a patchwork of cool clear streams, lagoons, floodplains and forested islands. In the dry winter season vast numbers of wildlife flock to where the floodwaters infiltrate the delta – providing one of the natural world’s most spectacular sights.