Interstate 73 (abbreviate I-73) is a main route of the Interstate Highway System, currently located entirely within the U.S. state of North Carolina. It is part of a longer planned corridor, defined by various Federal laws to run from Myrtle Beach, South Carolina, to Sault Ste. Marie, Michigan, but only the part south from Huntington, West Virginia, is currently under study. Closely related is the extension of Interstate 74 from Cincinnati, Ohio east to Georgetown, South Carolina, with several concurrencies planned.