the Potomac River forming its southern boundary), and Allegany County, Maryland to the east. The county's northwesternmost point is approximately southeast of Pittsburgh, Pennsylvania, and its southeasternmost point is approximately northwest of Baltimore, Maryland. Garrett County is located entirely within the highland zone of the Appalachian Mountains known variously as the Allegheny Mountains, the Allegheny Plateau, and the Appalachian Plateau. The county's highest elevations are located along four flat-topped ridges and range to a height of at Hoye-Crest along Backbone Mountain, the highest point in the state of Maryland. As is typical in the Allegheny region, broad flats generally lie below the ridge crests at elevations of approximately . River valleys are generally narrow and deep, with ravines typically 1,000 to below surrounding peaks. The county contains over of parks, lakes, and publicly accessible forestland. It is drained by two river systems, the Potomac and the Youghiogheny. The Savage River, a tributary of the Potomac, drains about a third of the county. The Casselman River, a tributary of the Youghiogheny, flows north from the county's central section into Pennsylvania. The Youghiogheny itself drains the westernmost area of the county and flows north into Pennsylvania, where it empties into the Monongahela River at McKeesport, just south of Pittsburgh. Geologic points of interest The Glades The Glades' is of great scientific interest because it is an ombrotrophic system (fed solely by rainwater) with peat layers up to thick, and is one of the oldest examples of mountain peatland in the Appalachians. On the western edge of the Savage River State Forest along Maryland Route 495 lies Bittinger, Maryland, which is named after Henry Bittinger, who first settled in the area and who was joined by other German settlers moving in and taking up the fertile farmland. On the eastern edge of Bittinger is one of the largest glades area of Garrett County. Geographically, this is an area that seems to have been affected by the last great ice sheet of North America. Two miles southeast of Bittinger, there is a large deposit of peat moss. Loess Dunes In the Casselman River valley, south of Grantsville, Maryland and beside Maryland Route 495, one can see remains of geological evidence about the last great ice sheet over North America. A series of low mounds can be seen in the fields on the west side of Maryland Route 495 that are "loess" (wind-blown) material. Apparently,