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Geography of Pennsylvania

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Title: Geography of Pennsylvania  
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Subject: Pennsylvania, Geography of Pennsylvania, Genesee River, Crime in Pennsylvania, Oil Region
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Geography of Pennsylvania

Pennsylvania cities and rivers

The Geography of Pennsylvania varies from sea level marine estuary to mountainous plateau, is significant for its natural resources and ports, and is notable for its role in the history of the United States.


  • Major features 1
  • The Pennsylvania Dutch region 2
  • Western Pennsylvania 3
  • The mountains 4
  • The shores 5
  • Ecological disasters 6
  • Climate 7
  • See also 8
  • References 9

Major features

Pennsylvania's nickname, the Keystone State, derives from the fact that the state forms a geographic bridge both between the Northeastern states and the Southern states, and between the Atlantic seaboard and the Midwest. It even has a toehold on the Great Lakes, with the Erie triangle. It is bordered on the north and northeast by New York; on the east by New Jersey; on the south by Delaware, Maryland, and West Virginia; on the west by Ohio; and on the northwest by Lake Erie. It has a short border on Lake Erie with Canada. The Delaware, Susquehanna, Monongahela, Allegheny, and Ohio rivers are the major rivers of the state. The Lehigh River, the Toughener River and Oil Creek are smaller rivers which have played an important role in the development of the state. It is one of the thirteen U.S. states that share a border with Canada.

Pennsylvania is 180 miles (290 km) north to south and 310 miles (500 km) east to west. The total land area is 44,817 square miles (116,080 km2)—739,200 acres (2,991 km2) of which are bodies of water. It is the 33rd largest state in the United States. The highest point of 3,213 feet (979 m) above sea level is at Mount Davis. Its lowest point is at sea level on the Delaware River. Pennsylvania is in the Eastern time zone.

The Pennsylvania Dutch region

The Pennsylvania Dutch region in south-central Pennsylvania is a favorite for sightseers. The Pennsylvania Dutch, including the Old Order Amish, the Old Order Mennonites and at least 15 other sects, are common in the rural areas around the cities of Lancaster, York, and Harrisburg, with smaller numbers extending northeast to the Lehigh Valley and up the Susquehanna River valley. (There are actually more Old Order Amish in Holmes County, Ohio, and there are plain sect communities in at least 47 states, but many Mennonites remain, particularly in Lancaster County.) Some adherents eschew modern conveniences and use horse-drawn farming equipment and carriages, while others are virtually indistinguishable from non-Amish or Mennonites. Descendants of the plain sect immigrants who do not practice the faith may refer to themselves as Pennsylvania Germans.

Despite the name, the people are not from the Netherlands, but rather are from various parts of southwest Germany, Alsace and Switzerland. The word "Dutch" here is left over from an archaic sense of the English word, which once referred to the entire West Germanic dialect continuum. It is also often thought to be a corruption of the German word for 'German,' which is "Deutsch." As one might imagine, a Pennsylvania Dutch settler would have been asked what nationality he was. His reply, in German, would have been "Deutsch," which was misunderstood as 'Dutch.'

Western Pennsylvania

The western third of the state can be considered a separate large geophysical unit, distinctive enough that it may best be described on its own. Several important, complex factors set Western Pennsylvania apart in many respects from the east, such as the initial difficulty of access across the mountains, rivers oriented to the Mississippi River drainage system, and above all, the complex economics involved in the rise and decline of the American steel industry centered around Pittsburgh. Other factors, such as a markedly different style of agriculture, the rise of the oil industry, timber exploitation and the old wood chemical industry, and even, in linguistics, the local dialect, all make this large area sometimes seem a virtual "state within a state".

The mountains

Pennsylvania terrain

Pennsylvania is bisected diagonally by ridges of the Appalachian Mountains from southwest to northeast. To the northwest of the folded mountains is the Allegheny Plateau, which continues into southwestern and south central New York. This plateau is so dissected by valleys that it also seems mountainous. The plateau is underlain by sedimentary rocks of Mississippian and Pennsylvanian age, which bear abundant fossils as well as natural gas and petroleum.

In 1859, near Titusville, Edwin L. Drake drilled the first oil well in the U.S. into these sediments.[1] Similar rock layers also contain coal to the south and east of the oil and gas deposits. In the metamorphic (folded) belt, anthracite (hard coal) is mined near Wilkes-Barre and Hazelton. These fossil fuels have been an important resource to Pennsylvania. Timber and dairy farming are also sources of livelihood for midstate and western Pennsylvania. Along the shore of Lake Erie in the far northwest are orchards and vineyards.

During the most recent Ice Age, the northeastern and northwestern corners of present-day Pennsylvania were buried under the southern fringes of the Laurentide ice sheet. Glaciers extended into the Appalachian valleys of central Pennsylvania, but the ice did not overtop the mountains. At its furthest extent it spread as far south as Moraine State Park, about 40 miles (64 km) north of Pittsburgh.

The shores

Pennsylvania has 57 miles (92 km) of shoreline along the Delaware River estuary.[2]The tidal marsh of this estuary has been protected as John Heinz National Wildlife Refuge at Tinicum. Pennsylvania is the only truly landlocked state of the original thirteen states, although Connecticut, located on the Long Island Sound, also has no actual coastline (The difference between coast and shore is explained in the respective articles).

Pennsylvania has one of the largest seaports in the U.S. on its narrow shore, the Port of Philadelphia. In the west the Port of Pittsburgh is also very large and even exceeds Philadelphia in rank by annual tonnage, because of the large volume of bulk coal shipped by barge down the Ohio River. Chester, downstream from Philadelphia, and Erie, the Great Lakes outlet on Lake Erie in the Erie Triangle, are smaller but still important ports.

Ecological disasters

Pennsylvania has been the site of some of the worst ecological disasters experienced in U.S. history:

  • In 1889, the South Fork Dam, impounding a recreational mountain lake for sportsmen, burst after a heavy rain and destroyed the downstream factory town of Johnstown, killing over 2,200 inhabitants in the notorious Johnstown Flood (the town was later rebuilt and is a reasonably large community today in the central mountains).
  • In 1948, an air inversion over Donora trapped pollution from nearby metal processing plants, killing 20 and causing health complications for many more.
  • In 1961, an exposed seam of coal at Centralia caught fire and eventually forced almost the entire community to abandon the area; the underground coal fire is still burning today and it is estimated that it can burn for another 250 years.
  • In 1979, the Three Mile Island Nuclear Power Incident near the state capital of Harrisburg, while not as destructive to the community, nevertheless cost close to $1 billion to clean up and changed the national public perception of nuclear power to a much less favorable viewpoint.


Pennsylvania has three general climate regions, which are determined by altitude more than latitude or distance from the oceans. Most of the state falls in the humid continental climate zone. The lower elevations, including most of the major cities, has a moderate continental climate (Köppen climate classification Dfa), with cool to cold winters and hot, humid summers. Highland areas have a more severe continental climate (Köppen Dfb) with warm, humid summers and cold, more severe and snowy winters. Extreme southeastern Pennsylvania, around Philadelphia borders into a humid subtropical climate (Köppen Cfa), with milder winters and hot, humid summers.

Precipitation is abundant throughout the state, as the primary climatic influences are the Atlantic Ocean and the Gulf of Mexico, plus Arctic influences that cross over the Great Lakes.

See also


  1. ^ "Titusville, Pennsylvania, 1896".  
  2. ^ NOAA Office of Ocean and Coastal Resource Management: My State: Pennsylvania
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