Columbia is a city in Maury County, Tennessee, United States. The 2008 population was 34,402 according to U.S. Census Bureau estimates. It is the county seat of Maury County.
The town is notable for being the self-proclaimed "Mule capital of the world" and honors this fact with Mule Day, a large celebration held annually every April. Columbia is also the home of the national headquarters for the Sons of Confederate Veterans.
Columbia is located at 35°36′54″N 87°2′40″W / 35.615°N 87.04444°W / 35.615; -87.04444 (35.615022, -87.044464). It is nestled along the banks of the Duck River at the southern edge of the Nashville Basin with the higher elevated ridges of the Highland Rim located to the south and west of the city. The Duck River is the longest river located entirely within the state of Tennessee. Free flowing for most of its length, the Duck River is home to over 50 species of freshwater mussels and 151 species of fish, making it the most biologically diverse river in North America. It enters the city of Manchester and meets its confluence with a major tributary, the Little Duck River, at Old Stone Fort State Park, named after an ancient Native American structure between the two rivers believed to be nearly 2,000 years old. The Duck River is sacred to most of the founding Native American tribes east of the Mississippi River.