The Shoreline of the Great Lakes is about 10,000 miles (16,000 kilometers) long. This is 44 percent of Earth's circumference. Find out more about these watery wonders in Great Lakes. This is an AV2 media enhanced book. A unique book code printed on page 2 unlocks multimedia content. This book comes alive with video, audio, weblinks, slide shows, activities, hands-on experiments, and much more. Book jacket.