[Greenpeace] The Okavango Basin is an endorheic basin that covers an area of over 2.5 million km2 across Namibia, Angola and Botswana. The basin, which includes the Okavango Delta, is one of Africa's most biodiverse habitats, home to a myriad of birds and megafauna species including the largest African elephant population left on the planet. The delta, a Ramsar and UNESCO World Heritage Site, remains one of the largest intact wetlands. Nearly one million people are dependent on the Okavango basin for their livelihoods.