The Withlacoochee River (North) originates in Georgia, northwest of Valdosta. It flows south into Florida, and eventually merges with the Suwannee at Suwannee River State Park west of Live Oak. It is believed to be the source for the name of the central Florida river. Valdosta is a city in, and the county seat of Lowndes County, Georgia, United States. ... Official language(s) English Capital Tallahassee Largest city Jacksonville Area Ranked 22nd - Total 65,794 sq mi (170,451 km²) - Width 162 miles (260 km) - Length 497 miles (800 km) - % water 17. ... Suwannee River, Florida The Suwannee River (also spelled Suwanee River) is a major river of southern Georgia and northern Florida in the United States. ... Suwannee River State Park is located near Live Oak, Florida in the United States. ... Live Oak is a city located in Suwannee County, Florida. ...