This engaging book introduces readers to the Mississippi River. The book explains how the river formed, what wildlife make their homes there, and how the river is changing. This book also includes a "That's Amazing!" special feature, several "Did You Know?" facts, a table of contents, quiz questions, a glossary, additional resources, and an index. This Focus Readers book is at the Beacon level, aligned to reading levels of grades 2–3 and interest levels of grades 3–5.