An interactive book about animals of seas and freshwater reservoirs, where augmented reality makes getting to know the underwater world especially vivid. The pages feature a wide variety of inhabitants—from a tiny jellyfish to a giant blue whale. You can observe the residents of rivers and lakes, seas and oceans right in the book: it’s not just reading, but a 4D format. Look at the illustrations, study three-dimensional animated models, and listen to educational audio materials. AR elements help you understand the topic better and remember new information for a long time, and the learning process becomes easy and truly fun. For students of middle and high school. Design, cover, illustrations: LLC “Intejer”, 2025; publishing house “AST”, 2025. In the design, materials from Shutterstock, Inc. (Shutterstock.com) and Dreamstime, Inc. (Dreamstime.com) stock photo banks were used.