Dry River Valleys in Central Libya29.1N 15.9E
The yellow tones of this desert area in central Libya are broken by dry river valleys (wadis), whose veinlike patterns can be seen across the landscape.
Wadis, as drainage courses, are formed by water, but are distinguished from river valleys or gullies in that surface water is intermittent or ephemeral.
Wadis, cut by stream in a desert environment, generally are dry year round except after a rain. The desert environment is characterized by a sudden but infrequent heavy rainfall often resulting in flash floods.