Lake George (lake), New York in the context of "Lake Champlain"

The Laurentide ice sheet (LIS) was a massive sheet of ice that covered millions of square miles, including most of Canada and a large portion of the Northern United States, multiple times during the Quaternary glaciation epochs, from 2.58 million years ago to the present.

The last advance covered most of northern North America between c. 95,000 and c. 20,000 years before the present day and, among other geomorphological effects, gouged out the five Great Lakes and the hosts of smaller lakes of the Canadian Shield. These lakes extend from the eastern Northwest Territories, through most of northern Canada, and the upper Midwestern United States (Minnesota, Wisconsin, and Michigan) to the Finger Lakes, through Lake Champlain and Lake George areas of New York, across the northern Appalachians into and through all of New England and Nova Scotia.

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.

The Beaver Wars (Mohawk: Tsianì kayonkwere, pronounced [d͡ʒanî gajũgwere]), also known as the Iroquois Wars or the French and Iroquois Wars (French: Guerres franco-iroquoises), were a series of conflicts fought intermittently during the 17th century in North America throughout the Saint Lawrence River valley in Canada and the Great Lakes region which pitted the Iroquois (Haudenosaunee) against the Wendat, northern Algonquians and their French allies. As a result of this conflict, the Iroquois destroyed several confederacies and tribes through warfare: the Wendat or Hurons, Erie, Neutral, Wenro, Petun, Susquehannock, Mohican and northern Algonquins whom they defeated and dispersed, some fleeing to neighbouring peoples and others assimilated, routed, or killed.

The Iroquois sought to expand their territory to monopolize the fur trade with European markets. They originally were a confederacy of the Mohawk, Oneida, Onondaga, Cayuga, and Seneca tribes inhabiting the lands in what is now Upstate New York along the shores of Lake Ontario east to Lake Champlain and Lake George on the Hudson River, and the lower-estuary of the Saint Lawrence River. The Iroquois Confederation led by the Mohawks mobilized against the largely Algonquian-speaking tribes and Iroquoian-speaking Wendat (Huron) and related tribes of the Great Lakes region. The Iroquois were supplied with arms by their Dutch and English trading partners; the Algonquians and Wendat were backed by the French, their chief trading partner.

The Trophic State Index (TSI) is a classification system designed to rate water bodies based on the amount of biological productivity they sustain. Although the term "trophic index" is commonly applied to lakes, any surface water body may be indexed.

The TSI of a water body is rated on a scale from zero to one hundred. Under the TSI scale, water bodies may be defined as:

Fort Ticonderoga (/taɪkɒndəˈroʊɡə/), formerly Fort Carillon, is a large 18th-century star fort built by the French at a narrows near the south end of Lake Champlain in northern New York. It was constructed between October 1755 and 1757 by French-Canadian military engineer Michel Chartier de Lotbinière, Marquis de Lotbinière during the French and Indian War, sometimes known overseas as the "North American theater" of the Seven Years' War. The fort was of strategic importance during the 18th-century colonial conflicts between Great Britain and France, and again played an important role during the American Revolutionary War.

The site controlled a river portage alongside the mouth of the rapids-infested La Chute River, in the 3.5 miles (5.6 km) between Lake Champlain and Lake George. It was strategically placed for the trade routes between the British-controlled Hudson River Valley and the French-controlled Saint Lawrence River Valley.