According to the U.S. Census Bureau, the county has a total area of 522 square miles (1,350 km²), of which 522 square miles (1,350 km²) is land and 0.3 square miles (0.78 km²) (0.06%) is water.
The county, which lies on the eastern edge of the Cumberland Plateau, is known for its rugged mountain terrain, and cold mountain streams and rivers.
 The Crab Orchard Mountains comprise a large area of the county, which includes several designated wilderness areas, Frozen Head State Park, and Lone Mountain State Forest.

The Emory River rises on the slopes of Bird Mountain near Wartburg.
 The Obed River, a designated national wild and scenic river, empties into the Emory southwest of Wartburg.
 The Clear Fork, which forms part of Morgan's boundary with Fentress County, joins the New River in Scott County to the north to form the Big South Fork of the Cumberland River.

The Cumberland Trail passes through Morgan County.
According to the U.S. Census Bureau, the county has a total area of 522 square miles (1,350 km²), of which 522 square miles (1,350 km²) is land and 0.3 square miles (0.78 km²) (0.06%) is water. The county, which lies on the eastern edge of the Cumberland Plateau, is known for its rugged mountain terrain, and cold mountain streams and rivers.  The Crab Orchard Mountains comprise a large area of the county, which includes several designated wilderness areas, Frozen Head State Park, and Lone Mountain State Forest.
The Emory River rises on the slopes of Bird Mountain near Wartburg.  The Obed River, a designated national wild and scenic river, empties into the Emory southwest of Wartburg.  The Clear Fork, which forms part of Morgan's boundary with Fentress County, joins the New River in Scott County to the north to form the Big South Fork of the Cumberland River.
The Cumberland Trail passes through Morgan County.
Morgan County, Tennessee