Allegheny Plateau in the context of Tennessee

New York, also called New York State, is a state in the northeastern United States. Bordered by the New England states to the east, Canada to the north, and Pennsylvania and New Jersey to the south, its territory extends into both the Atlantic Ocean and the Great Lakes. New York is the fourth-most populous state in the United States, with nearly 20 million residents, and the 27th-largest state by area, with a total area of 54,556 square miles (141,300 km).

New York has a varied geography. The southeastern part of the state, known as Downstate, encompasses New York City, the most populous city in the United States; Long Island, with approximately 40% of the state's population, the nation's most populous island; and the cities, suburbs, and wealthy enclaves of the lower Hudson Valley. These areas are the center of the expansive New York metropolitan area and account for approximately two-thirds of the state's population. The larger Upstate area spreads from the Great Lakes to Lake Champlain and includes the Adirondack Mountains and the Catskill Mountains (part of the wider Appalachian Mountains). The east–west Mohawk River Valley bisects the more mountainous regions of Upstate and flows into the north–south Hudson River valley near the state capital of Albany. Western New York, home to the cities of Buffalo and Rochester, is part of the Great Lakes region and borders Lake Ontario and Lake Erie. Central New York is anchored by the city of Syracuse; between the central and western parts of the state, New York is prominently featured by the Finger Lakes, a popular tourist destination. To the south, along the state border with Pennsylvania, the Southern Tier sits atop the Allegheny Plateau, representing some of the northernmost reaches of Appalachia.

The Finger Lakes are a group of eleven long, narrow, roughly north–south lakes located in an area called the Finger Lakes region in New York, in the United States. This region straddles the northern and transitional edge of the Northern Allegheny Plateau, known as the Finger Lakes Uplands and Gorges ecoregion, and the Ontario Lowlands ecoregion of the Great Lakes Lowlands.

The geological term finger lake refers to a long, narrow lake in an overdeepened glacial valley, while the proper name Finger Lakes goes back to the late 19th century. Cayuga and Seneca Lakes are among the deepest in the United States, measuring 435 and 618 feet (133 and 188 m), respectively, with bottoms well below sea level. Though none of the lakes' widths exceed 3.5 miles (5.6 km), Seneca Lake is 38.1 miles (61.3 km) long, and at 66.9 square miles (173 km) is the largest in total area.

The Catskill Mountains, also known as the Catskills, are a physiographic province and subrange of the larger Appalachian Mountains, located in southeastern New York. As a cultural and geographic region, the Catskills are generally defined as those areas close to or within the borders of the Catskill Park, a 700,000-acre (2,800 km) forest preserve protected from many forms of development under New York state law.

Geologically, the Catskills are a mature dissected plateau, a flat region subsequently uplifted and eroded into sharp relief by watercourses. The Catskills form the northeastern end of the Allegheny Plateau (also known as the Appalachian Plateau).

The Southern Tier is a geographic subregion of the broader upstate region of New York State, geographically situated along or very near the state border with Pennsylvania. Definitions of the region vary widely, but generally encompass counties surrounding the Binghamton, Elmira-Corning, and Jamestown metropolitan areas, along with the land of the Seneca Nation. This region is adjacent to the Northern Tier of Pennsylvania, and both these regions together are known as the Twin Tiers.

Geographically, most of the Southern Tier resides in the Allegheny Plateau of the Appalachian Mountains, with the eastern areas of the region nestled in the western portion of the Catskill Mountains. A longtime home of the Iroquois Confederacy, European settlers moved to the region after the American Revolutionary War. The fertile yet hilly land, combined with sweeping river valleys, led the region to support a combination of manufacturing industries (including large companies such as IBM and Corning Inc.) and farming, but with less development compared to neighboring subregions of upstate. Since the 1950s, the area is often considered to be a part of the Rust Belt, as manufacturing jobs have left the region.

The West Branch Susquehanna River is one of the two principal branches, along with the North Branch, of the Susquehanna River in the Northeastern United States. The North Branch, which rises in upstate New York, is generally regarded as the extension of the main branch, with the shorter West Branch being its principal tributary.

The West Branch, which is 243 miles (391 km) long, is entirely within the state of Pennsylvania, draining a large mountainous area within the Allegheny Plateau in the western part of the state. Along most of its course it meanders past mountain ridges and through water gaps, forming a large zigzag arc through central Pennsylvania around the north end of the Allegheny Mountains. In colonial times, the river valley provided an important route to the Ohio River valley. In the 19th century, its lower valley became a significant industrial heartland of Pennsylvania. In the 20th century, the upper reaches of the West Branch turned a yellow/orange color due to sulfurous drainage from nearby and abandoned deep bituminous coal mines.

The Monongahela River (/məˌnɒŋɡəˈhiːlə/ mə-NONG-gə-HEE-lə, /-ˈheɪ-/ -⁠HAY-), sometimes referred to locally as the Mon (/mɒn/), is a 130-mile-long (210 km) river on the Allegheny Plateau in north-central West Virginia and Southwestern Pennsylvania. The river flows from the confluence of its west and east forks in north-central West Virginia northeasterly into southwestern Pennsylvania, then northerly to Pittsburgh and its confluence with the Allegheny River to form the Ohio River. The river includes a series of locks and dams that makes it navigable.

New York, also called New York state, is a state in the northeastern United States. Bordered by the New England states to the east, Canada to the north, and Pennsylvania and New Jersey to the south, its territory extends into both the Atlantic Ocean and the Great Lakes. New York is the fourth-most populous state in the United States, with nearly 20 million residents, and the 27th-largest state by area, with a total area of 54,556 square miles (141,300 km).

New York has a varied geography. The southeastern part of the state, known as Downstate, encompasses New York City, the most populous city in the United States; Long Island, with approximately 40% of the state's population, the nation's most populous island; and the cities, suburbs, and wealthy enclaves of the lower Hudson Valley. These areas are the center of the expansive New York metropolitan area and account for approximately two-thirds of the state's population. The larger Upstate area spreads from the Great Lakes to Lake Champlain and includes the Adirondack Mountains and the Catskill Mountains (part of the wider Appalachian Mountains). The east–west Mohawk River Valley bisects the more mountainous regions of Upstate and flows into the north–south Hudson River valley near the state capital of Albany. Western New York, home to the cities of Buffalo and Rochester, is part of the Great Lakes region and borders Lake Ontario and Lake Erie. Central New York is anchored by the city of Syracuse; between the central and western parts of the state, New York is prominently featured by the Finger Lakes, a popular tourist destination. To the south, along the state border with Pennsylvania, the Southern Tier sits atop the Allegheny Plateau, representing some of the northernmost reaches of Appalachia.

The Erie people were an Indigenous people of the Northeastern Woodlands historically living on the south shore of Lake Erie. An Iroquoian-speaking tribe, they lived in what is now western New York, northwestern Pennsylvania, and northern Ohio before 1658. Their nation was almost exterminated in the mid-17th century by five years of prolonged warfare with the powerful neighboring Iroquois for helping the Huron in the Beaver Wars for control of the fur trade. Captured survivors were adopted or enslaved by the Iroquois.

Their villages were burned by Haudenosaunee warriors. This destroyed their stored maize and other foods, added to their loss of life, and threatened their future, as they had no way to survive the winter. The attacks likely forced their emigration. The Haudenosaunee Confederacy was known for adopting captives and refugees into their tribes. The surviving Erie are believed to have been largely absorbed by other Iroquoian tribes, particularly families of the Seneca, the westernmost of the Five Nations. Susquehannock families may also have adopted some Erie, as the tribes had shared the hunting grounds of the Allegheny Plateau and Kittanning Path that passed through the gaps of the Allegheny. The members of remnant tribes living among the Iroquois gradually assimilated to the majority cultures, losing their independent tribal identities.

The Cumberland Plateau is the southern part of the Appalachian Plateau in the Appalachian Mountains of the United States. It includes much of eastern Kentucky and Tennessee, and portions of northern Alabama and northwest Georgia. The terms "Allegheny Plateau" and the "Cumberland Plateau" both refer to the dissected plateau lands lying west of the main Appalachian Mountains. The terms stem from historical usage rather than geological difference, so there is no strict dividing line between the two. Two major rivers share the names of the plateaus, with the Allegheny River rising in the Allegheny Plateau and the Cumberland River rising in the Cumberland Plateau in Harlan County, Kentucky.

The Allegheny Front is the major southeast- or east-facing escarpment in the Allegheny Mountains in southern Pennsylvania, western Maryland, eastern West Virginia, and western Virginia. The Allegheny Front forms the boundary between the Ridge-and-Valley Appalachians to its east and the Appalachian Plateau (locally called the Allegheny Plateau) to its west. The Front is closely associated with the Appalachian Mountains' Eastern Continental Divide, which in this area divides the waters of the Ohio/Mississippi river system, flowing to the Gulf of Mexico, from rivers flowing into Chesapeake Bay and from there into the Atlantic Ocean.

The Allegheny Front and the Eastern Continental Divide do not always coincide; for example, the North Branch of the Potomac River begins well west of the Front, at the Fairfax Stone near the southwestern tip of Maryland, about 10 miles (16 km) and across the actual divide from the headwaters of the Youghiogheny River draining northwards into the Monongahela and Ohio rivers. The Front and the Divide diverge completely in central Pennsylvania where the West Branch Susquehanna River originates north of the Allegheny Front.

The following is a list of subranges within the Appalachian Mountains, a mountain range stretching ~2,050 miles from Newfoundland and Labrador, Canada to Alabama, US. The Appalachians, at their initial formation, were a part of the larger Central Pangean Mountains along with the Scottish Highlands, the Ouachita Mountains, and the Anti-Atlas Mountains. The modern ranges were formed and/or deformed by the Acadian, Caledonian, Alleghenian, Mauritanide and Variscan orogenies with the Alleghenian orogeny being the most notable to the modern Appalachians.

The Appalachians are also subdivided by a number of large plateaus and additional subplateus. These are commonly not considered subranges although they do contain some features referred to as mountains which are assigned to both their geographic "range" and the more general Appalachian Mountains. These plateaus, such as the Allegheny Plateau, are considered provinces of the Appalachian Highlands and the mountains assigned to them are instead considered pieces of dissected plateaus.

The Unglaciated Allegheny Plateau is located in an arc around southeastern Ohio, West Virginia, into western Pennsylvania and a small portion of southwestern New York State.

This area is a dissected plateau, characterized by sandstone, shale, and many coal seams. This is the part of the Allegheny Plateau that lies outside the continental glaciation of the ice age.

The Glaciated Allegheny Plateau is the portion of the Allegheny Plateau in the Appalachian Mountains that lies within the area covered by the last glaciation. As a result, this area of the plateau has lower relief and gentler slopes than the relatively rugged Unglaciated Allegheny Plateau. It lies to the north and west of the unglaciated plateau, and forms an arc in northeastern to southeastern Ohio lying between the glacial till plains and the Unglaciated Allegheny Plateau. The Glaciated Allegheny Plateau extends into a belt of southern New York State and the central Susquehanna River basin. Major cities on the Glaciated Allegheny Plateau are Akron and Youngstown.

A small area of the Allegheny Plateau was glaciated during the Wisconsin Stage, the late Illinoian Stage, and Pre-Illinoian B and G glaciations of the Pre-Illinoian Stage. This area – only a few hundred square kilometers owing to the blockage the steep relief of the mountains provides at the edge of the ice sheet – contains only old drift now buried by long periods of soil development.

The Allegheny Mountain Range (/ˌælɪˈɡeɪni/ AL-ih-GAY-nee)—also spelled Alleghany or Allegany, less formally the Alleghenies—is part of the vast Appalachian Mountain Range of the Eastern United States and Canada. Historically, it represented a significant barrier to westward land travel and development. The Alleghenies have a northeast–southwest orientation, running for about 300 miles (480 km) from north-central Pennsylvania southward, through western Maryland and eastern West Virginia.

The Alleghenies comprise the rugged western-central portion of the Appalachians. They rise to 4,862 feet (1,482 m) in northeastern West Virginia. In the east, they are dominated by a high, steep escarpment known as the Allegheny Front. In the west, they slope down into the closely associated Allegheny Plateau, which extends into Ohio and Kentucky. The principal settlements of the Alleghenies are Altoona, State College, and Johnstown, Pennsylvania; and Cumberland, Maryland.

The West Fork River is a principal tributary of the Monongahela River, 103 miles (166 km) long, in north-central West Virginia, United States. Via the Monongahela and Ohio Rivers, it is part of the watershed of the Mississippi River, draining an area of 881 square miles (2,284 km²) on the unglaciated portion of the Allegheny Plateau.

The Tygart Valley River — also known as the Tygart River — is a principal tributary of the Monongahela River, approximately 135 miles (217 km) long, in east-central West Virginia in the United States. Via the Monongahela and Ohio rivers, it is part of the watershed of the Mississippi River, draining an area of 1,329 square miles (3,440 km) in the Allegheny Mountains and the unglaciated portion of the Allegheny Plateau.

The Battle of Fort Necessity, also known as the Battle of the Great Meadows, took place on July 3, 1754, in present-day Farmington in Fayette County, Pennsylvania. The engagement, along with a May 28 skirmish known as the Battle of Jumonville Glen, was the first military combat experience for George Washington, who was later selected as commander of the Continental Army during the American Revolutionary War by the Second Continental Congress in Philadelphia.

The Battle of Fort Necessity began the French and Indian War, which later spiraled into the global conflict known as the Seven Years' War. Washington built Fort Necessity on an alpine meadow west of the summit of a pass through the Laurel Highlands of the Allegheny Mountains. Another pass nearby leads to Confluence, Pennsylvania; to the west, Nemacolin's Trail begins its descent to Uniontown, Pennsylvania, and other parts of Fayette County along the relatively low altitudes of the Allegheny Plateau.

New York, also called New York State, is a state in the northeastern United States. Bordering New England to its east, Canada to the north, and Pennsylvania and New Jersey to the south, its territory extends into both the Atlantic Ocean and the Great Lakes. New York is the fourth-most populous state in the United States, with nearly 20 million residents, and the 27th-largest state by area, with a total area of 54,556 square miles (141,300 km).

New York has a varied geography. The southeastern part of the state, known as Downstate, encompasses New York City, the most populous city in the United States; Long Island, with approximately 40% of the state's population, the nation's most populous island; and the cities, suburbs, and wealthy enclaves of the lower Hudson Valley. These areas are the center of the expansive New York metropolitan area and account for approximately two-thirds of the state's population. The larger Upstate area spreads from the Great Lakes to Lake Champlain and includes the Adirondack Mountains and the Catskill Mountains (part of the wider Appalachian Mountains). The east–west Mohawk River Valley bisects the more mountainous regions of Upstate and flows into the north–south Hudson River valley near the state capital of Albany. Western New York, home to the cities of Buffalo and Rochester, is part of the Great Lakes region and borders Lake Ontario and Lake Erie. Central New York is anchored by the city of Syracuse; between the central and western parts of the state, New York is prominently featured by the Finger Lakes, a popular tourist destination. To the south, along the state border with Pennsylvania, the Southern Tier sits atop the Allegheny Plateau, representing some of the northernmost reaches of Appalachia.