not flow into a sea or ocean.
The Okavango Delta is a large inland delta located in the Kalahari Desert of north-west Botswana. It is the world's largest inland delta, covering an area of over 15,000 km2. The Okavango Delta is an oasis in the middle of the desert and is fed by the Okavango River, which originates in the highlands of Angola and flows southwards into the delta, where the water is blocked by the sands of the Kalahari Desert. The delta is home to an array of flora and fauna, and is a major tourist destination. The area is seasonally flooded with water from the Okavango River and the seasonal rains, creating a lush wetland environment with permanent marshlands and seasonally flooded plains. The Okavango Delta is one of the few major interior delta systems that do not flow into a sea or ocean, with the water instead evaporating or percolating down into the underlying aquifers.