 The valleys are from west to east the Alleghany Valley, the Bluegrass Valley, the Monterey Valley, the Bullpasture Valley, and the Cowpasture Valley.The majority of the county and all the southern portions of the county form part of the James River watershed, while northern sections drain into the Potomac River.West of Monterey, the divide is roughly centered along the path of U.S. Route 250; however, in eastern Highland County, the James watershed extends further northward.