Simplify the following text for a Grade 9 native English-speaking person.
Original: It lies near the geographic center of Georgia , approximately 85 miles ( 136 km ) south of Atlanta , hence the city 's nickname as the Heart of Georgia .
Simplified: It is located near the geographic center of Georgia , more or less 75 miles ( 129 km ) south of Atlanta , that 's why the city 's called the Heart of Georgia .