At the bottom of this picture you can see the Three Gorges dam in China. This is the largest dam in the world and the reservoir behind the dam is 600 kms long. There are many environmental and cultural problems with this dam but it also makes a lot of power and prevents flooding which has always been a problem for people on this river. It is hard to get a picture of this dam from space because the clouds and smog usually obscure the view.
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