Just two rivers originating in southern Angola supply nearly all the water that flows into Botswana’s Okavango Delta. Protecting them is the key to preserving the richness of life in this unique place.
From the modest elevation of the Angolan highlands (top left of the animated map above), water has basically two ways down: rushing steeply down the western side, or sliding gently along the gradual lowering of the plateau to the south and east.
When the annual rains come (illustrated by increased plant growth, shown in green) in the steep, rocky west they rush quickly down waterfalls, form deep channels, and feed the seasonal floods of the Cubango River. This drives the dramatic seasonal expansion of life in the Okavango Delta (the fan-shaped bloom of green in the center).
After building up for weeks, water eventually bursts forth from the southern part of the delta, forming the Boteti River, and flows out to the Makgadikgadi Pans. These seasonal salt pans by that time have already turned to lakes, fed by floodwaters of the Zambezi to the northeast. (On the middle left of the map, note the similar salt pans that have no significant feeders and stay dry year-round.)
Water Map by Martin Gamache, Art of the Mappable; Source: USGS/FEWS NET (data source: NASA). Photographs by Chris Boyes (“Water”), GÖTZ NEEF (“Biodiversity”), Kostadin Luchansky (“Community”).