The Okavango Delta is one of the world's largest inland delta. The headwaters of the river depart from the Highlands of Angola and along with other tributaries form the river Cubango, which arrives in Namibia as the Kavango and then enters in Botswana, where is called Okavango. In the past the Okavango flowed up to an inland lake called Lake Makgadikgadi, now become the desert of Magkadikgadi Pans. The tectonic activity interrupted the course of the river forming the Delta and creating a unique ecosystem of fauna and flora. The floods of Delta beginning with the rains in Angola, ranging from October to April, and arrived on the border between Namibia and Botswana in December to reach the southern part of the Delta in Maun in mid-July, employing almost nine months from the north end to the South. This slow phase of flood is due to the lack of difference in altitude of 60 meters in 450 kilometers. At the end of its travel, the delta runs out in the Kalahari desert, via the Boteti River and 95% of the remaining water evaporation. During the peak of the flood, the Delta area expands to 16,000 square kilometers, returning to about 9,000 square kilometers in dry periods. The environment of the delta, has a huge population of fauna in the area. Crocodiles, red lechwe, sitatunga, elephant, Cape Buffalo, wild dogs, African jacana.