DRY VALLEY

A dry valley is a valley found in either Karst (limestone) or chalk terrain that no longer has a surface flow of water. There are many examples of the latter along the North and South Downs in southern England. Examples include the Alkham Valley near Dover, and the Hartley Bottom and Fawkham valleys near Dartford in north Kent.details
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The McMurdo Dry Valleys are a row of valleys in Antarctica located within Victoria Land west of McMurdo Sound. The region includes many interesting geological features including Lake Vida and the Onyx River, Antarctica's longest river. It is also one of the world's most extreme deserts. From north to south, the three main valleys are Victoria Valley, Wright Valley and Taylor Valley.
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