A great valley, a geographic rift that extends thousand of miles. That's what we were looking for in today's Geo Quiz.
Great Rift Valley: http://flickr.com/photos/74671419@N00/
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And the answer is: The Great Rift Valley.
This valley contains a chain of lakes and marshes. That makes it a perfect route for millions of birds migrating between Asia and Africa.
The World's Quil Lawrence thinks he spotted about 20 thousand of them on recent bird-watching tour in northern Israel.
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