Parr’s Ridge and Mt. Airy
Parr’s Ridge is a crest which forms the zenith of the Piedmont Plateau in Maryland. This ridge stretches out from southwest to northeast through Montgomery, Howard and Carroll counties. The tallest peak is in Maryland east of the Appalachian Mountains. The Patapsco River has a tributary known as Parr’s spring. It converges at Montgomery, Howard, Carroll, and Frederick. The spring is submerged underneath a pond on the grounds of the “Four County Farm.”
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