No Water Makes a River


Rivers with no water at all – doesn't it sound like nonsense? However, there are lots of dry rivers in the arid regions of our planet. During dry season they look like desert ravines, but when it rains they turn into powerful and turbulent streams.

ВадиIn the Arab world temporary rivers have a special name – “wadi”. Shortly after it stops raining all water drains down to the sands, and wadi becomes dry again. Some wadi systems with tributaries are over a hundred kilometers long. Riverbeds of such systems are covered with gravel and pebbles, which means that a long time ago there were real rivers.