This refers to the fact that six of the original states are north of Pennsylvania, six south. Pennsylvania lies between New York on the north and Maryland and West Virginia on the south. Pennsylvania s northeast corner touches New York, its southeast corner Delaware. The Delaware River separates Pennsylvania from New Jersey on the east, while Ohio borders Pennsylvania on the west. Though Pennsylvania is farther south than New England, temperatures remain cool in areas of higher mountains.
Geologists recognize seven different regions in Pennsylvania.
Most of these are associated with the Appalachian Mountains. The most important of these are the Appalachian Plateau and the Ridge and Valley region. The Ridge and Valley region is known for its evenly spaced hills and valleys. Seen from above, it appears almost as a river winding across Pennsylvania from northeast to southwest. The hills and valleys are more irregular in the Appalachian Plateau region.