This week takes us back to Namibia. This photo was taken while flying over the dessert near Sossusvlei. From the sky, one can easily see the dried out river beds that carry water, if it ever rains. In this case, the lines of the river beds are nicely offset by the red lines formed by the dunes on the top right.
The circular spots are not spots on the chip of my camera. They are Fairy Circles. What causes them is actually still subject of ongoing debate. A quick internet search will show that the debate still goes on.