Marianna is a city in and the county seat of Lee County, Arkansas, United States. Located along the L'Anguille River in the Arkansas Delta just north of the St. Francis National Forest, the community was known as Walnut Ridge until 1852 when it became known as Marianna. The city's economy has historically been based on agricultural, especially cotton production. The city is located along Crowley's Ridge Parkway and the Great River Road, both National Scenic Byways showcasing Crowley's Ridge and the Mississippi River.