The Lehigh River is a tributary of the Delaware River located in eastern Pennsylvania, USA. It stretches approximately 109 miles and flows through the scenic Lehigh Valley, passing through towns like Allentown and Bethlehem. The river is known for its clear waters and beautiful landscapes, making it a popular destination for outdoor activities such as fishing, kayaking, and hiking. Historically, the Lehigh River played a significant role in the region's industrial development, particularly during the 19th century when it was used for transporting coal and other goods. Today, it is also recognized for its ecological importance, supporting various wildlife and plant species along its banks.