This ancient clay pan was once an oasis, studded with acacias and fed by a river that suddenly changed course, leaving the earth to dry up along with the trees it previously supported. So dry were the climatic conditions that the trees never decomposed – instead they were entirely leached of moisture so that today, 900 years later, they remain as desiccated, blackened sentinels dotting the pan’s cracked surface. Surrounded by the red-pink dunes of the Namibia Desert, they create a surreal spectacle that is a photographer's dream.