The Trail of the Ancients is a collection of National Scenic Byways located in the U.S. Four Corners states of Utah, Colorado, New Mexico, and Arizona. These byways comprise: * The 366-mile (589 km) Trail of the Ancients National Scenic Byway in San Juan County, Utah; * The 116-mile (187 km) Trail of the Ancients Scenic and Historic Byway in Montezuma County, Colorado; * The 662.4-mile (1,066 km) Trail of the Ancients Scenic Byway in McKinley and San Juan counties, New Mexico; * The 100.3-mile (161 km) Dine' Tah "Among the People" Scenic Road in Apache County, Arizona, and the 26-mile (42 km) Kayenta-Monument Valley Scenic Road in Navajo County, Arizona.