Earth's many rivers are exciting to study. Some move quickly over rapids, roaring in the ears of travelers. Others are home to flesh-eating turtles or ferocious fish. One runs through the majestic Grand Canyon! Readers explore some of the biggest and coolest rivers in the world, including the Amazon and the Nile, learning about each river's environment and wildlife. Full-color photographs within an eye-catching layout take readers to the world's biggest waterfall and complement basic science concepts, such as the water cycle. Geography has never been so exciting!