Tuscaloosa is situated on the Black Warrior River approximately 60 miles southwest of Birmingham. The city occupies a unique location of fall line of the Black Warrior River on the boundary between the Appalachian Highland and the Gulf Coastal Plain approximately 311 km (120 mi.) upriver from the river's confluence with the Tombigbee River in Demopolis. Consequently, the geography of the area around Tuscaloosa is quite diverse, being hilly and forested to the northeast and low-lying and marshy to the southwest.