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In all the history of human kind on the planet earth, sea has had a special impact on his life. However at the beginning it had been in one way, but as the time went on and with the advancement in the technology and the increasing dependency of human being on sea and seafaring, the nature of this relation changed to a bilateral mode. This bilateral nature of it has always brought benefits for human being. In this book we have explained different world's straits and their benefits.