Along with his companions from nine nations, Heyerdahl set sail in a boat made of reeds in search of the sea routes which he was sure must have been used by the Sumerians in vessels like his own, 5000 years ago. Heyerdahl recounts the many discoveries and hazards that occurred on his journey down the Tigris, through the Gulf and on to the Indian Ocean - tales of modern shipping, bandits, reefs and the political dispute which finally led to the ceremonial burning of the boat.