12 The Yangtze River -ThinkstockPhotos-541581528.jpg

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The Yangtze River is one of the best rivers for cruises. It’s also ideal for a daring open water swim, as Martin Strel proves again. In 2004, in 51 days of struggling in the muddy river for 2,487 miles, he surpassed his record from the Mississippi. This project was the most demanding to date in all respects, according to his website.