Alabama is the thirty-first largest state in the United States with of total area. 3.19% of the area is water, making Alabama twenty-third in the amount of surface water, also giving it the second largest inland waterway system in the United States. About three-fifths of the land area is a plain with a general downward slope towards the Mississippi River and the Gulf of Mexico. North Alabama has mostly mountains, with the Tennessee River cutting a large valley creating many creeks, streams, rivers, mountains, and lakes.