North and South Marietta Parkway form a ring road in Marietta, Georgia that was once designated as Georgia State Route 120 Loop (SR 120 Loop) before route realignments in 2007. The full loop is approximately 9 miles (14 km) in circumference and has an interchange with Interstate 75 (I-75) twice, once on the north side of Marietta and once on the south side. The southern segment of the road is designated as a part of SR 120 and the northern segment forms SR 120 Alternate (SR 120 Alt.).