Topics: Lehigh Valley - Wikipedia
The Lehigh Valley is geologically and geographically part of the Great Appalachian Valley , a region largely made up of limestone that stretches along the eastern edge of the Appalachian Mountains. The Lehigh Valley is so named because it is composed of an actual valley that lies between two mountain ranges, Blue Mountain to the north and South Mountain to the south. Lehigh Valley also is considered part of the historic Pennsylvania Dutch Country.
The United States Office of Management and Budget has designated the Lehigh Valley area of Pennsylvania as the Allentown–Bethlehem–Easton, PA Metropolitan Statistical Area.  The three counties in the Metropolitan area are Carbon , Lehigh and Northampton. As of the 2010 United States Census the Metro area had a population of 821,173. The Lehigh Valley ranks as the third most populous metropolitan areas in the state of Pennsylvania and ranks 68th most populous in the United States.
The Lehigh Valley has four distinct seasons, which typically include humid summers, cold winters, and very short and mild springs and falls.