"Okavango Delta forms from the water of Okavango River which creates a huge swampy area in Kalahari desert. A few of millions of years ago the Okavango River was flowing into the Lake Makgadikgadi but, due to tectonic activity, the flow has been interrupted and this caused emergence of the Okavango Delta. The main source of the water for the delta are seasonal Angolan rains which are lasting from October to April. When the flods are most intensive, Okavango Delta covers more than 16,000 square kilometers but, during the dry period of the year, its surface is less than 9,000 square kilometers."
