Elephants at water hole, Etosha, Namibia

This photo was taken at Etosha National Park, in Namibia. Through the action of topography, water collects to make mud pits in low areas in veldt regions that also play host to elephants. Elephants turn these damp low spots into muddy wallows, and through consistent use carry off more of the earth from the low point, deepening it steadily until it holds open water.