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Southwestern Ontario is a secondary region of
Southern Ontario Southern Ontario is a primary region of the province of Ontario, Canada, the other primary region being Northern Ontario. It is the most densely populated and southernmost region in Canada. The exact northern boundary of Southern Ontario is disp ...
in the
Canadian Canadians (french: Canadiens) are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of ...
province of
Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca ...
. It occupies most of the
Ontario Peninsula The Ontario Peninsula is the southernmost part of the province of Ontario, and of Canada as a whole. It is bounded by Lake Huron to the west, Lake Ontario to the east, and Lake Erie to the south. At its tip, it is separated from Michigan by the D ...
bounded by
Lake Huron Lake Huron ( ) is one of the five Great Lakes of North America. Hydrologically, it comprises the easterly portion of Lake Michigan–Huron, having the same surface elevation as Lake Michigan, to which it is connected by the , Straits of Mack ...
, including
Georgian Bay Georgian Bay (french: Baie Georgienne) is a large bay of Lake Huron, in the Laurentia bioregion. It is located entirely within the borders of Ontario, Canada. The main body of the bay lies east of the Bruce Peninsula and Manitoulin Island. T ...
, to the north and northwest; the
St. Clair River The St. Clair River (french: Rivière Sainte-Claire) is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed November 7, 2011 river in central North America which flows from Lake Huron int ...
, Lake St. Clair, and
Detroit River The Detroit River flows west and south for from Lake St. Clair to Lake Erie as a strait in the Great Lakes system. The river divides the metropolitan areas of Detroit, Michigan, and Windsor, Ontario—an area collectively referred to as Detro ...
, to the west; and
Lake Erie Lake Erie ( "eerie") is the fourth largest lake by surface area of the five Great Lakes in North America and the eleventh-largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also ha ...
to the south. To the east, on land, Southwestern Ontario is bounded by
Central Ontario Central Ontario is a secondary region of Southern Ontario in the Canadian province of Ontario that lies between Georgian Bay and the eastern end of Lake Ontario. The population of the region was 1,123,307 in 2016; however, this number does not in ...
and the
Golden Horseshoe The Golden Horseshoe is a secondary region of Southern Ontario, Canada, which lies at the western end of Lake Ontario, with outer boundaries stretching south to Lake Erie and north to Lake Scugog, Lake Simcoe and Georgian Bay of Lake Huron. The ...
. The region had a population of 2,583,544 in 2016. It is sometimes further divided into "Midwestern Ontario" covering the eastern half of the area and the heart of Southwestern Ontario encompassing the western half of the region.


Definitions

The Government of Ontario also classifies municipalities along the eastern side of Southwestern Ontario near the Grand River, including Wellington County (containing Guelph), the
Region of Waterloo The Regional Municipality of Waterloo (Waterloo Region or Region of Waterloo) is a metropolitan area of Southern Ontario, Canada. It contains the cities of Cambridge, Kitchener and Waterloo (KWC or Tri-Cities), and the townships of North Dumf ...
(containing Kitchener, Waterloo, and Cambridge), and
Brant County The County of Brant (2021 population 39,474) is a single-tier municipality in the Canadian province of Ontario. Although it retains the word " county" in its name, the municipality is a single-tier municipal government and has no upper tier. The ...
(containing Brantford), as part the "Greater Golden Horseshoe" region that surrounds western
Lake Ontario Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the U.S. state of New York. The Canada–United States border sp ...
. Some non-profit organizations, government bodies, and news organizations also classify a larger swath of the eastern side of Southwestern Ontario (the area from Huron County,
Bruce County Bruce County is a county in Southwestern Ontario, Canada comprising eight lower-tier municipalities and with a 2016 population of 66,491. It is named for James Bruce, 8th Earl of Elgin and 12th Earl of Kincardine, sixth Governor General of the ...
, and
Grey County Grey County is a county of the Canadian province of Ontario. The county seat is in Owen Sound. It is located in the subregion of Southern Ontario named Southwestern Ontario. Grey County is also a part of the Georgian Triangle. At the time of t ...
in the north, southward through
Dufferin County Dufferin County is a county and census division located in Central Ontario, Canada. The county seat is Orangeville, and the current Warden is Wade Mills. The current chief administrative officer is Sonya Pritchard. Dufferin covers an area of , ...
, Wellington County, the Region of Waterloo, Perth County, and Oxford County, and sometimes south to
Brant County The County of Brant (2021 population 39,474) is a single-tier municipality in the Canadian province of Ontario. Although it retains the word " county" in its name, the municipality is a single-tier municipal government and has no upper tier. The ...
and Norfolk County on Lake Erie) as being "Midwestern Ontario." This thereby places only the counties southwest of this in their definition of Southwestern Ontario, although in some cases Perth County is also grouped in Southwestern Ontario.


History

Archaeological findings from the Princess Point Complex suggest that indigenous peoples grew maize in the region as early as 260 CE. Iroquoians are recognizable from 500 CE, and by 900 CE longhouse villages began appearing near modern-day
Brantford Brantford ( 2021 population: 104,688) is a city in Ontario, Canada, founded on the Grand River in Southwestern Ontario. It is surrounded by Brant County, but is politically separate with a municipal government of its own that is fully independ ...
. Europeans settlement began in the early 18th century, when it was part of the Royal Province of
New France New France (french: Nouvelle-France) was the area colonized by France in North America, beginning with the exploration of the Gulf of Saint Lawrence by Jacques Cartier in 1534 and ending with the cession of New France to Great Britain and Spa ...
. One of the oldest continuous settlements in the region is Windsor, which originated as a southerly extension of the settlement of
Fort Detroit Fort Pontchartrain du Détroit or Fort Detroit (1701–1796) was a fort established on the north bank of the Detroit River by the French officer Antoine de la Mothe Cadillac and the Italian Alphonse de Tonty in 1701. In the 18th century, Fre ...
in 1701. With the transfer of New France to British control in 1763, the region was part of the British Province of Quebec, 1774 to 1791; the Province of
Upper Canada The Province of Upper Canada (french: link=no, province du Haut-Canada) was a Province, part of The Canadas, British Canada established in 1791 by the Kingdom of Great Britain, to govern the central third of the lands in British North Americ ...
, 1791 to 1841; and the
Canada West The Province of Canada (or the United Province of Canada or the United Canadas) was a British colony in North America from 1841 to 1867. Its formation reflected recommendations made by John Lambton, 1st Earl of Durham, in the Report on the ...
division of the Province of United Canada, 1841 to Confederation in 1867, when United Canada was formally partitioned into the provinces of
Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca ...
and
Quebec Quebec ( ; )According to the Canadian government, ''Québec'' (with the acute accent) is the official name in Canadian French and ''Quebec'' (without the accent) is the province's official name in Canadian English is one of the thirte ...
. During the 19th century and early 20th century, the largest city in Southwestern Ontario was Windsor; however, as both cities grew, Windsor was outpaced by the faster growth of London, and passed the mantle of regional anchor to that city in the 1960s. Late in the 20th century the Kitchener–Cambridge–Waterloo metropolitan area became the most populous metropolitan area in southwestern Ontario surpassing the London-St. Thomas metropolitan area, and serves as the anchor of Midwestern Ontario. Southwestern Ontario is a prosperous agricultural region whose chief crops are
tobacco Tobacco is the common name of several plants in the genus '' Nicotiana'' of the family Solanaceae, and the general term for any product prepared from the cured leaves of these plants. More than 70 species of tobacco are known, but the ...
,
sweet corn Sweet corn (''Zea mays'' convar. ''saccharata'' var. ''rugosa''), also called sugar corn and pole corn, is a variety of maize grown for human consumption with a high sugar content. Sweet corn is the result of a naturally occurring recessive muta ...
,
soybean The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible bean, which has numerous uses. Traditional unfermented food uses of soybeans include soy milk, from which tofu ...
,
winter wheat Winter wheat (usually '' Triticum aestivum'') are strains of wheat that are planted in the autumn to germinate and develop into young plants that remain in the vegetative phase during the winter and resume growth in early spring. Classificatio ...
,
canola Close-up of canola blooms Canola flower Rapeseed oil is one of the oldest known vegetable oils. There are both edible and industrial forms produced from rapeseed, the seed of several cultivars of the plant family Brassicaceae. Historically, ...
, and
tomato The tomato is the edible berry of the plant ''Solanum lycopersicum'', commonly known as the tomato plant. The species originated in western South America, Mexico, and Central America. The Mexican Nahuatl word gave rise to the Spanish word ...
es. Dairy and beef farming, breeding and training of
standardbred horse The Standardbred is an American horse breed best known for its ability in harness racing, where members of the breed compete at either a trot or pace. Developed in North America, the Standardbred is recognized worldwide, and the breed can trace i ...
s and wine growing and production are also important industries. Its climate is among the mildest in Canada. Although brief periods of winter can be severe, summers are hot and humid with a longer growing season than in most of the country. A large section of Southwestern Ontario was part of the
Talbot Settlement Thomas Talbot (July 19, 1771February 5, 1853) was an Irish-born Canadian soldier and colonial administrator. He founded the community of Port Talbot, Ontario, which was at one time the most prosperous town in the region due to his insistence on ...
, and the region has benefited from the settlement’s facilitation of agriculture and of trade in general. Its economy is heavily tied in with that of the
midwest The Midwestern United States, also referred to as the Midwest or the American Midwest, is one of four Census Bureau Region, census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of ...
ern
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
, in particular the border state of
Michigan Michigan () is a state in the Great Lakes region of the upper Midwestern United States. With a population of nearly 10.12 million and an area of nearly , Michigan is the 10th-largest state by population, the 11th-largest by area, and t ...
. Auto manufacturing and parts, agriculture and hi-tech industries are key components of the region’s economy. The region also provides important transportation routes for commercial
trucking Road transport or road transportation is a type of transport using roads. Transport on roads can be roughly grouped into the transportation of goods and transportation of people. In many countries licensing requirements and safety regulations e ...
,
railway Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a p ...
and tanker shipping from
Detroit Detroit ( , ; , ) is the largest city in the U.S. state of Michigan. It is also the largest U.S. city on the United States–Canada border, and the seat of government of Wayne County. The City of Detroit had a population of 639,111 at t ...
-
Windsor Windsor may refer to: Places Australia * Windsor, New South Wales ** Municipality of Windsor, a former local government area * Windsor, Queensland, a suburb of Brisbane, Queensland **Shire of Windsor, a former local government authority around Wi ...
and
Port Huron, Michigan Port Huron is a city in the U.S. state of Michigan and the county seat of St. Clair County. The population was 30,184 at the 2010 census. The city is adjacent to Port Huron Township but is administered separately. Located along the St. Clair ...
-Sarnia linking Canada with major markets in the eastern and midwestern United States. Today the largest cities in Southwestern Ontario, in order of population (2016), are:
London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...
, Kitchener,
Windsor Windsor may refer to: Places Australia * Windsor, New South Wales ** Municipality of Windsor, a former local government area * Windsor, Queensland, a suburb of Brisbane, Queensland **Shire of Windsor, a former local government authority around Wi ...
,
Guelph Guelph ( ; 2021 Canadian Census population 143,740) is a city in Southwestern Ontario, Canada. Known as "The Royal City", Guelph is roughly east of Kitchener and west of Downtown Toronto, at the intersection of Highway 6, Highway 7 and Wel ...
,
Cambridge Cambridge ( ) is a university city and the county town in Cambridgeshire, England. It is located on the River Cam approximately north of London. As of the 2021 United Kingdom census, the population of Cambridge was 145,700. Cambridge bec ...
, Waterloo,
Brantford Brantford ( 2021 population: 104,688) is a city in Ontario, Canada, founded on the Grand River in Southwestern Ontario. It is surrounded by Brant County, but is politically separate with a municipal government of its own that is fully independ ...
,
Sarnia Sarnia is a city in Lambton County, Ontario, Canada. It had a 2021 population of 72,047, and is the largest city on Lake Huron. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron f ...
,
Woodstock Woodstock Music and Art Fair, commonly referred to as Woodstock, was a music festival held during August 15–18, 1969, on Max Yasgur's dairy farm in Bethel, New York, United States, southwest of the town of Woodstock. Billed as "an Aq ...
, St. Thomas, Leamington, and Stratford. Chatham is also a major population centre, but is not an independent municipality and is part of
Chatham-Kent Chatham-Kent (Canada 2021 Census, 2021 population: 104,316)Essex County and higher amounts north towards
Bruce County Bruce County is a county in Southwestern Ontario, Canada comprising eight lower-tier municipalities and with a 2016 population of 66,491. It is named for James Bruce, 8th Earl of Elgin and 12th Earl of Kincardine, sixth Governor General of the ...
. London receives approximately 30% more snowfall than Windsor, owing to its relative position to Lake Huron and the resulting snowbelt in Bruce and Middlesex counties. Under the
Köppen climate classification The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, nota ...
, much of this area has a
humid continental climate A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers and freez ...
(Köppen ''Dfa/Dfb'' borderline).


Infrastructure

The southern portion of Southewestern Ontario is the most populated and industrialized section of the region. The southern portion is bisected by
Highway 401 King's Highway 401, commonly referred to as Highway 401 and also known by its official name as the Macdonald–Cartier Freeway or colloquially referred to as the four-oh-one, is a controlled-access 400-series highway in the Canadian provin ...
which runs through Windsor and past London to Woodstock and Waterloo-Wellington region. Highway 402 runs from London to
Sarnia Sarnia is a city in Lambton County, Ontario, Canada. It had a 2021 population of 72,047, and is the largest city on Lake Huron. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron f ...
. The region is also serviced by major ports in Goderich on Lake Huron,
Windsor Windsor may refer to: Places Australia * Windsor, New South Wales ** Municipality of Windsor, a former local government area * Windsor, Queensland, a suburb of Brisbane, Queensland **Shire of Windsor, a former local government authority around Wi ...
on Lake Erie and just to the east
Hamilton Hamilton may refer to: People * Hamilton (name), a common British surname and occasional given name, usually of Scottish origin, including a list of persons with the surname ** The Duke of Hamilton, the premier peer of Scotland ** Lord Hamilto ...
on Lake Ontario which is major destination for regionally produced grain. Windsor, London and Kitchener-Waterloo also have significant regional airports with some international flights.


Dialect

The accent in the region, Southwestern Ontario English, is distinct from the rest of Ontario.


Subdivisions


Single-tier municipalities

*
County of Brant The County of Brant ( 2021 population 39,474) is a single-tier municipality in the Canadian province of Ontario. Although it retains the word "county" in its name, the municipality is a single-tier municipal government and has no upper tier. The ...
*
Chatham-Kent Chatham-Kent (Canada 2021 Census, 2021 population: 104,316)Haldimand County Haldimand County is a rural city-status single-tier municipality on the Niagara Peninsula in Southern Ontario, Canada, on the north shore of Lake Erie, and on the Grand River. Despite its name, it is no longer a county by definition, as all mu ...
* Norfolk County


Separated municipalities

* City of Brantford * City of Guelph *
City of London The City of London is a city, ceremonial county and local government district that contains the historic centre and constitutes, alongside Canary Wharf, the primary central business district (CBD) of London. It constituted most of London f ...
* City of Owen Sound * Pelee Township * City of Sarnia * Town of St. Marys * City of St. Thomas * City of Stratford *
City of Windsor Windsor is a city in southwestern Ontario, Canada, on the south bank of the Detroit River directly across from Detroit, Michigan, United States. Geographically located within but administratively independent of Essex County, Ontario, Essex Coun ...
* City of Woodstock * Town of Tillsonburg


Regional municipalities

* Oxford County *
Waterloo Region The Regional Municipality of Waterloo (Waterloo Region or Region of Waterloo) is a metropolitan area of Southern Ontario, Canada. It contains the cities of Cambridge, Kitchener and Waterloo (KWC or Tri-Cities), and the townships of North Dumf ...


Counties

*
Bruce County Bruce County is a county in Southwestern Ontario, Canada comprising eight lower-tier municipalities and with a 2016 population of 66,491. It is named for James Bruce, 8th Earl of Elgin and 12th Earl of Kincardine, sixth Governor General of the ...
*
Dufferin County Dufferin County is a county and census division located in Central Ontario, Canada. The county seat is Orangeville, and the current Warden is Wade Mills. The current chief administrative officer is Sonya Pritchard. Dufferin covers an area of , ...
(partially extended) *
Elgin County Elgin County is a county of the Canadian province of Ontario with a 2016 population of 50,069. Its population centres are St. Thomas, Aylmer, Port Stanley, Belmont, Dutton and West Lorne. The county seat is St. Thomas, which is separated from t ...
* Essex County *
Grey County Grey County is a county of the Canadian province of Ontario. The county seat is in Owen Sound. It is located in the subregion of Southern Ontario named Southwestern Ontario. Grey County is also a part of the Georgian Triangle. At the time of t ...
* Huron County *
Lambton County Lambton County is a county in Southwestern Ontario, Canada. It is bordered on the north by Lake Huron, which is drained by the St. Clair River, the county's western border and part of the Canada-United States border. To the south is Lake Saint Cl ...
* Middlesex County * Perth County * Wellington County


References

{{Authority control Geographic regions of Ontario