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The Amazon is over 6,400km long and crosses over nine countries. But one can't find any bridges on the river. Walter Kaufmann, the chair of Structural Engineering at Swiss Federal Institute of Technology in Zurich, explained to Live Science the reason behind it. He said many of the areas the river runs through are sparsely populated. This means there aren't any major roads for a bridge to connect to, Besides, the towns the river touches have other transport facilities to ferry people from one side to another without the need for a bridge. There are also technical issues. There will be a need for a large financial investment as the river's marshes and soft soils would reate need for 'long access viaducts and deep foundations'.