The Tennessee River has traditionally been the northern border of the city and Morgan County, but a small portion of the city extends across the river into Limestone County between U.S. 31 and I-65. Major bodies of water in the city include Wheeler Lake, Flint Creek, Lake Morgan, and Chula Vista Lake, all estuaries of the Tennessee River. The city does extend to the other side of Flint Creek and the Refuge in the Indian Hills and Burningtree subdivision areas. There is also an inlet that extends one mile (2 km) into the city limits from Wheeler Lake called Dry Branch.