The San Pedro Riparian National Conservation Area (San Pedro Riparian NCA) contains nearly 57,000 acres (23,000 ha) of public land in Cochise County, Arizona, between the international border with Mexico and St. David, Arizona. The riparian area, where some 40 miles (64 km) of the upper San Pedro River meanders, was designated by Congress as a Riparian National Conservation Area on November 18, 1988.