Interstate 81 (I-81) is an 855.02-mile-long (1,376.02 km) north–south Interstate Highway, stretching from Dandridge, Tennessee, northeast to Fisher's Landing, New York, at the Canada–United States border. In the state of Pennsylvania, I-81 runs for 232.76 miles (374.59 km) from the Maryland state line near Greencastle northeast to the New York state line near Hallstead and is called the American Legion Memorial Highway. It is the longest north–south Interstate in Pennsylvania.