Other smaller lakes hold red and brown water, a result of the interplay of water depth and resident organisms such as algae. The algae color varies depending on water temperature and salinity. (A similar process is observed in pink and red floodwaters when they pond in Lake Eyre, a mostly dry lake in Australia. In Lake Eyre, researchers know that the color is indeed due to algae growth.)
Typically, little water or sediment reaches the floor of the Etosha Pan because the water seeps into the riverbeds along their courses. The floor of the pan itself is only rarely covered by even a thin sheet of water. In this image, there was enough surface flow to reach the pan, but too little to flow beyond the inlet bay. A prior flood event, when water entered the pan via the Oshigambo River, was documented in astronaut imagery in 2006.
The straight line that crosses the image is the northern fence line of Namibia’s Etosha National Park. This three-meter-high fence keeps wildlife from crossing into the numerous small farms of the relatively densely populated Owambo region of Namibia, north of the pan. The large Etosha lakebed (120 kilometers long, or 75 miles) is at the center of Namibia’s largest wildlife park and a major tourist attraction.
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