Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: History comes alives in a riveting adventure

I loved this book. This book was great in so many ways. It is a great portrait of Teddy Roosevelt in his quest to explore an uncharted tributary of the Amazon after his presidency. It is a fascinating look at life in the unexplored rain forest - featuring the people, plants, animals and general ecology. It's a riveting life-or-death adventure. The author does a great job moving between the people in the present drama, their backgrounds, and the "life of the forest." It's a beautifully written page-turner. It leaves one with a profound sense of the place, people and time. I can't recommend this book more highly. Years ago, I read Undaunted Courage, the story of Lewis and Clark's expedition. I liked it, but that never grabbed me like River of Doubt did. This sets a new standard for "exploration history" literature. Read it!