The geography of New York varies widely across the state. Most of New York is dominated by farms, forests, rivers, mountains, and lakes. New York's Adirondack Park is larger than any U.S. National Park in the contiguous United States. Niagara Falls, on the Niagara River as it flows from Lake Erie to Lake Ontario, is a popular attraction. The Hudson River begins near Lake Tear of the Clouds and flows south through the eastern part of the state without draining lakes George or Champlain. Lake George empties at its north end into Lake Champlain, whose northern end extends into Canada, where it drains into the Richelieu River and then the St. Lawrence. Four of New York City's five boroughs are on the three islands at the mouth of the Hudson River: Manhattan Island, Staten Island, and Brooklyn and Queens on Long Island.
"Upstate" is a common term for New York counties north of suburban Westchester, Rockland and Dutchess counties. Upstate New York typically includes the Catskill Mountains or areas North of the Catskill Mountains, the Capital District, The Adirondacks, the Erie Canal, Lake Champlain, Otsego Lake, Oneida Lake; rivers such as the Delaware, Genesee, Mohawk, and Susquehanna. The highest elevation in New York is Mount Marcy of the Adirondack Mountains. New York is the 27th-largest state.
Location and size
New York is located in the northeastern United States, in the Mid-Atlantic Census Bureau division. New York covers an area of 54,556 square miles (141,299 km2) making it the 27th largest state by total area (but 30th by land area). The state borders six U.S. states: Pennsylvania to the west, New Jersey and Connecticut to the south, Rhode Island (across Long Island Sound), Massachusetts, and Vermont to the east. New York also borders the Canadian provinces of Ontario and Quebec to the north. Additionally, New York touches the Atlantic Ocean to the southeast, and two of the Great Lakes: Lake Erie to the west and Lake Ontario to the northwest.
Geology
The current geological makeup of New York State is the result of the orogenous event that formed the Appalachians, followed by millions of years of erosion and sediment deposition. The most recent major geologic force that shaped New York's landscape into its current form was the movement of a glacier during the late Pleistocene, which began to recede from the region around 18,000 years ago, leaving behind many characteristic landforms, such as the Hudson River, the Finger Lakes, and the Helderberg Escarpment.
New York is part of the Marcellus Shale, a gas-rich rock formation which also extends across Ohio, Pennsylvania and West Virginia.
Topography
New York lies upon the portion of the Appalachian Mountains where the mountains generally assume the character of hills and finally sink to a level of the lowlands that surround the great depression filled by Lake Ontario and the St. Lawrence River. Three distinct mountain masses can be identified in the state. The most easterly of these ranges—a continuation of the Blue Ridge Mountains of Virginia—enters the state from New Jersey and extends northeast through Rockland and Orange counties to the Hudson River, continuing on the east side of that river as the highlands of Putnam and Dutchess counties. A northerly extension of the same range passes into the Green Mountains of western Massachusetts and Vermont. This range is known in New York as the Hudson Highlands. The highest peaks are above sea level. The rocks that compose these mountains are principally primitive or igneous, and the mountains themselves are rough, rocky, precipitous, and unfit for cultivation.
The second series of mountains enters the state from Pennsylvania and extends northeast through Sullivan, Ulster, and Greene counties, terminating and culminating in the Catskill Mountains west of the Hudson River. The highest peaks are above sea level. The Shawangunk Mountains, a high and continuous ridge extending between Sullivan and Orange counties and into the southern part of Ulster County, is the extreme eastern range of this series. The Helderberg and Hellibark Mountains are spurs extending north from the main range into Albany and Schoharie counties. This whole mountain system is principally composed of rocks of the New York system above the Medina sandstone. The summits are generally crowned with red sandstone and with the conglomerate of the coal measures. The declivities are steep and rocky, and a large share of the surface is too rough for cultivation.
The third mountainous region, occupying the northeast part of the state, is known as the Adirondack Mountains. The region is bounded to the south by the Mohawk River, south of which the highlands become part of the Allegheny Plateau, in the form of broad, irregular hills, broken by the deep ravines of streams. The valley of the Mohawk separates the Allegheny Plateau to the south from the highlands leading to the Adirondacks to the north, reaching its narrowest point in the neighborhood of Little Falls, the Noses, and other places. North of the Mohawk the highlands extend northeast in several distinct ranges, all terminating upon Lake Champlain. The culminating point of the whole system, and the highest mountain in the state, is Mount Marcy, standing above sea level. The rocks of all this region are principally of igneous origin, and the mountains are usually wild, rugged, and rocky. A large share of the surface is entirely unfit for cultivation, but the region is rich in minerals, and especially in an excellent variety of iron ore.
In western New York, a series of hills forming spurs of the Allegheny Mountains enter the state from Pennsylvania and occupy the entire Southern Pennsylvania of the west part of the state. An irregular line extending through the southerly counties forms the watershed that separates the northern and southern drainage; and from it the surface gradually declines northward until it finally terminates in the level of Lake Ontario. The portion of the state lying south of this watershed and occupying the greater part of the two southerly tiers of counties is entirely occupied by these hills. Along the Pennsylvania line they are usually abrupt and are separated by narrow ravines, but toward the north their summits become broader and less broken. A considerable portion of the highland region is too steep for profitable cultivation and is best adapted to grazing. The highest summits in Allegany and Cattaraugus counties are above sea level.
From the summits of the watershed, the highlands usually descend toward Lake Ontario in a series of terraces, the edges of which are outcrops of different rocks beneath the surface. These terraces are usually smooth, and, although inclined toward the north, the inclination is generally so slight that they appear level. Between the hills of the south and the level land of the north is a beautiful rolling region, the ridges gradually declining toward the north. In that part of the state, south of the most eastern mountain range, the surface is generally level or broken by low hills. In Manhattan and Westchester County, these hills are principally composed of primitive rocks. The surface of Long Island is generally level or gently undulating. A ridge high, composed of sand, gravel, and clay, extends east and west across the island north of its center.
Climate
Most of Upstate New York is classified as humid continental in the Köppen climate classification system, while Downstate has a warmer humid subtropical climate. Winter temperatures are below freezing on average in most of the state during January and February but are above freezing along the Atlantic coast. Between June and September, summer-like conditions exist statewide, with longer summer conditions lasting from May to October in the south. Western New York experiences more cloud cover than the rest of the state due to the Great Lakes.
Precipitation in the state is fairly even throughout the year. Thunderstorm systems and snowstorms frequently cross the state from the southwest and from the Great Lakes as lake-effect snow. Major impacts from hurricanes or tornadoes are rare.
Rivers and lakes
The river system of the state has two general divisions. The first is the streams tributary to the Great LakesGeography of New York State:Lakes and the St. Lawrence River. The second are those tributaries that flow in a general southerly direction. The watershed divide that separates these two systems extends in an irregular line eastward from Lake Erie, through the southern tier of counties to near the northeast corner of Chemung County. It then turns northeast to the Adirondack Mountains in Essex County, then southeast to the east extremity of Lake George, and then nearly due east to the east border of the state.
The northerly division has five general subdivisions. The most westerly of these comprises all the streams flowing into Lake Erie and the Niagara River and those flowing into Lake Ontario west of the Genesee River. In Chautauqua County, the streams are short and rapid, as the watershed approaches within a few miles of Lake Erie. Cattaraugus, Buffalo, Tonawanda, and Oak Orchard creeks are the most important streams in this division. Buffalo Creek is chiefly noted for forming Buffalo Harbor at its mouth; and the Tonawanda for from its mouth was once used for canal navigation. Oak Orchard and other creeks flowing into Lake Ontario descend from the interior in a series of rapids, affording a large amount of waterpower.
The second subdivision comprises the Genesee River and its tributaries. The Genesee rises in the northern part of Pennsylvania and flows in a generally northerly direction to Lake Ontario. Its upper course is through a narrow valley bordered by steep, rocky hills. Upon the line of Wyoming and Livingston counties, it breaks through a mountain barrier in a deep gorge and forms the Portage Falls. Below this point the course of the river is through a valley wide and bordered by banks high. At Rochester it flows over the precipitous edges of the Niagara limestone, forming the Upper Genesee Falls; and below it flows over the edge of the Medina sandstone, forming the Lower Genesee Falls. The principal tributaries of this stream are Canaseraga, Honeoye, and Conesus creeks from the south, and Oatka and Black creeks from the west. Honeoye, Canadice, Hemlock, and Conesus lakes—four of the Finger Lakes—lie within the Genesee Basin.