This is a TNC (The Nature Conservancy) preserve on Savage Mountain in the Maryland Highlands. From the TNC website:

A window into ice ages past, Finzel Swamp is located in a “frost pocket,” an area where the surrounding hills capture moisture and cold air that conspire to create a landscape more reminiscent of habitat found much further north in Canada…. In addition to the shrub swamp, the preserve contains three other distinct plant communities, and is the headwaters to the Savage River.  The mountain peatlands created by this rare mix of altitude, temperature, and precipitation are home to a spectacular range of plants, birds, and mammals.

Finzel is about 2600 feet above sea level. It is the headwaters of the Savage River. For comparison, Cranberry Glades in the Cranberry Wilderness of the West Virginia Highlands is a much larger frost pocket. Cranberry is about 3600 feet above sea level and is the headwaters of the Cranberry River.

28-90mm Leica Vario-Elmarit, Nikon 800e, Lr4, Ps CS6.