Among the five resources of the earth, water plays a vital role in our lives. The author has chosen the best rivers of the world across all continents and has written about their contributions to agriculture, trade and ship movements, in short for human settlements and civilizations. The author expects the people to keep the rivers and lakes clean because man will become extinct without water on earth. The book is a warning to mankind to return to nature and preserve it for our children and grandchildren in the coming years.