From the bestselling series that began with Tree: A Peek-Through Picture Book comes an elaborate and beautiful children's book with peek-through holes that show the amazing life in the world's oceans. Discover a world teeming with life beneath the waves, with graceful sea horses, darting tropical fish, electric eels, and humpback whales. A colorful array of sea creatures is brought to life by award-winning illustrator Britta Teckentrup in this delightful, innovative book—with peek-through holes that reveal details of the ocean with each turn of the page. It's the perfect light nonfiction book for young readers curious about the world around them. And it will spark great conversations about the importance of keeping our oceans clean and protecting the amazing creatures who live there.