How does the Appalachian Highlands' geography look?

The Appalachian Highlands extend from eastern Canada to central Alabama. The entire system is 2,000 miles long. (The Appalachian Mountains are the region's higher and rougher areas.) Geographically, the Appalachians are complex. Some areas are covered by rocky deposits and glacial lakes; others have deep valleys with rough terrain; others have rapids and small waterfalls.