The Seven Sisters Oak is the largest certified southern live oak tree. Located in Mandeville, Louisiana, it is estimated to be up to 1,500 years old with a trunk that measures 38 feet (11.6 meters). This oak is also the National Champion on the National Register of Big Trees and the Champion Oak of Louisiana according to the Louisiana Forestry Association. The owner who first named the tree was Carole Hendry Doby, who was one of seven sisters. There are seven sets of branches leading away from the center trunk.