The Duck River is considered North America's most biologically diverse river, flowing 284 miles entirely within Tennessee. As the longest river in the state, it winds through seven counties from the Barrens in Middle Tennessee through Manchester, eventually joining the Tennessee River near New Johnsonville. This remarkable waterway supports 151 species of fish, 60 freshwater mussel species, and 22 species of aquatic snails, making it one of three global hotspots for fish and mussel diversity according to the US Geological Survey. With its varied terrain featuring boulder fields, diamond chop riffles, cliff walls, and grass banks, the Duck River offers exceptional fishing opportunities throughout its course.